11 Reasons Why a Betta Fish Lays at the Bottom of the Tank

Betta fish owners will witness all kinds of weird behavior.

Still, a betta that’s laying on the bottom of the tank does sound alarming.

Is the fish turned on one side or are its fins supporting its body?

Is that a symptom of a serious illness or just another odd trait of character?

Will it be okay eventually or is that the final straw?

Why does it look as if your betta is breathing heavily?

Is it suffocating?

Let me explain.

A healthy betta needs its personal space, frequent water changes, and a properly diversified diet.

For the fish to prefer to stand still in an unnatural pose could mean a number of things.

Let me expand on those.

Figuring out why your betta fish lays on its side at the base of the aquarium

I can’t help but find the Betta one of the most weirdly-mannered fish I have ever kept. As they enjoy their privacy, In many cases putting a couple of aquatic plants will take care of the issue, but not always. Here’s why a Betta fish may lay on its side at the bottom of its tank:

A Betta fish may be resting on the bottom of its tank due to polluted aquarium water. Foul water conditions can make the fish lethargic due to the stress and in the worst-case scenario – poison the creature. Another common reason for a Betta that doesn’t move from the bottom would be a filter current that’s too strong for the fish to swim comfortably.

Regularly testing the water for the build-up of lethal Ammonia or Nitrite, and performing weekly aquarium maintenance can be a reliable way to keep a fish tank clean.

Note that this behavior is not always the result of something bad happening in the fish tank.

Here are the details:

1. It may be sleeping.

Betta fish, like most other animals, do need rest and will sleep. The fish will often find a comfortable place on the bottom of the aquarium where it will lay and take a nap during the night.

Sometimes a betta will snooze on a big leaf, closer to the top of the tank, as that’s where they do it in the wild.

Betta fish are not nocturnal, so their sleeping habits dictate being active during the daytime and going to sleep at night, or when the room gets dark.

They may also sleep in portions of about 1 hour at a time, multiple times a night.

Betta fish like to sleep lying on their side. It’s an interesting trait of theirs adding to their popularity among fishkeepers.

If your pet friend appears otherwise healthy and active, it is probably just taking a nap on the bottom.

Fun fact: There are even “betta beds” that represent artificial leaves, large enough to support a resting betta. Chewy, the reputable online store for pet supplies, has them in under 4 bucks.

If you’re like me (amused at how absurd it looks) then you’d be happy to give your pet a comfy bed.

The leaf should be mounted at the top of the tank.

Closer to the surface is where Betta fish spend their time in the wild.

Caution: Don’t mistake sleep with exhaustion. A betta will go to sleep whenever the lights are off.

Keeping them on constantly can confuse the fish. It will swim around until it’s exhausted and then have a prolonged rest somewhere in the tank.

Exhaustion can weaken your betta’s immune system.

2. It has Nitrate poisoning.

Long-term exposure to Nitrate is one of the if not, the most common reason behind a Betta fish that’s lethargically lying on the bottom of its aquarium.

Is your Betta fish also progressively losing its coloration and beginning to look pale?

Is it lacking appetite?

Do its gills move rapidly as if the fish is out of breath?

If you notice a combination of these signs then it’s very likely that your Betta spends its time on the tank’s bottom because it has been poisoned by the Nitrate content in its aquarium water.

If you click the link you’ll learn everything about that condition and how to immediately treat it, but I’ll give you a quick rundown.

Prolonged exposure to even 20 ppm (parts per million) of Nitrate will sooner or later cause signs of illness.

You’ll hear most aquarists say that anything between 20 and 40 ppm is safe to have in a freshwater aquarium.

This, however, is a common misunderstanding that originated from the fact that nitrate is relatively less harmful when compared to nitrite and ammonia.

Both ammonia and nitrite are extremely toxic to aquarium fish, where nitrate is more of a silent, slow killer.

Arm yourself with a reliable liquid test kit and perform a water test. Test strips can only give a rough estimation of the situation but are nowhere near accurate.

In the case of poisoning, you’d need to know exactly how much Nitrate is there in the Betta fish tank.

This is so because you’ll need to calculate how much water you’ll need to remove.

A good water test to precisely measure the Nitrate in an aquarium would be the API Master test kit (this link leads to Chewy.com).

You’ll now need to physically remove the Nitrate through water changes but do so in a slow and controlled manner. Changing too much aqurium at once may cause shock to your Betta fish.

3. It’s lazy.

Sometimes, it’s not a lack of sleep but rather a lack of motivation.

If the front pelvic fins are moving and supporting a Betta that’s sitting on the bottom of its tank, then the fish is most likely being lazy.

Being lazy is a common trait of ornamental Betta fish.

Having huge fins is not always fun for swimming, so the fish eventually develops a habit of chilling at random places in the aquarium, and more often than not, this happens to be the bottom.

Monitor the behavior of your fish.

If your Betta moves around and feeds normally in-between “rests” then there’s nothing you should worry about.

Anyway, getting it one of the Betta hammocks I mentioned above will provide it with its own resting space, away from the bottom.

4. It has a malfunctioning Swim Bladder.

Another reason for a Betta to remain on the bottom or even swim sideways may be the swim bladder disorder (click the link to check the extensive guide I wrote on that).

The Betta fish’s swim bladder is narrowed due to overfeeding or constipation, among other reasons.

The stomach swells, hindering the swim bladder’s proper functioning.

The condition is not lethal in its nature but it makes swimming really hard for the fish.

Sometimes a Swim Bladder malfunction causes Betta fish to spend a lot of their time laying around the bottom, as they find it difficult to move.

They may also float uncontrollably to the top, but still turned sideways or even upside-down.

The disease can be treated by fasting the fish and feeding it foods that contain more fiber.

An approach I find extremely effective is to feed the betta a crushed pea or some Daphnia, which are both an excellent source of fiber.

For the former – peel the pea and boil it before the offering. You should fast the fish for at least 1 day (24+ hours) after that.

Be sure to clean the tank of pea leftovers, as cooked peas can make a mess in the aquarium’s water.

Using Daphnia is pretty straight forward and the preferred choice among aquarists.

Personally, I also prefer to feed my Betta some Daphnia as it is a natural source of fiber for this fish. Betta fish are carnivorous and that’s what they would eat if they were in the wild.

To avoid constipation and, consequently, Swim Bladder malfunctions I can recommend feeding your Betta with high-fiber food at least twice a week.

The other type of bloating in Betta fish can be avoided if you soak any pellets for 2 to 3 minutes or so before feeding them to your fish.

This allows the food to swell outside of my fish’s stomach.

Don’t forget you need to soak them in aquarium water, or at least one that has been dechlorinated.

For extra constipation-prevention diversify your Betta’s menu by feeding it bloodworm (a type of water flea larvae) occasionally.

Bloodworms are another food that replicates the natural diet of a Betta fish. An organic diet may help the fish in fighting off disease and it can also make its bright colors stand out more.

5. Filter current is too fast.

Some may argue that Bettas don’t really need a filter because the fish can get tired quickly if the output current is too strong for its oversized fins.

Though the part about Betta fish not needing a filter is wrong, it’s definitely recommended to go for a sponge filtration in smaller fish tanks of 5 or fewer gallons.

That’s unless your aquarium kit comes with a built-in filter, which usually isn’t too strong.

Most selectively-bred Betta fish have massive fins that make swimming in more turbulent water difficult.

So if your Betta seems less active and prefers to relax on the bottom of its tank, try tuning down the filter’s water circulation.

Not every filter has a flow-controlling valve, but many do.

My success for a 10-gallon single Betta tank has been with this such one filter (link to view it on Chewy) which has the adjustable flow feature.

Being able to control the flow in a small tank has made my pet friend twice as active.

For small fish tanks that hold between 3 and 5 gallons of water, you can likely get away with using a cheap sponge filter such as this one (make sure to get the “Mini”).

For my larger tanks that include a betta or other community fish with large fins, however, I am quite satisfied with using the AquaClear Power Filter 50. Chewy has those as well.

In my opinion, that last one crushes the competition on price tags that come with the same functionalities.

Both HOB filters work pretty well with my super poly-fil hack, by the way (link goes to my article on that).

Anyway, if you can’t get a filter with an adjustable flow rate right now, there are several DIY approaches you can try:

  • Strap a bio bag or any other kind of filter media on your filter’s water outlet. You can use a rubber band, fishing line or a cable zip tie to secure its placement.
  • Disperse the flow from the filter. Although you can get awfully creative here, I can confirm two easy and efficient ways to do that:

    – Tank divider kits are super cheap and will provide you with the perfect flow baffle and the means to attach it. Mount the mesh in front of the flow outlet.

    – Use a brand new plastic soap dish. Soap can be toxic to fish, so go and get a new cheap one from Walmart. They usually come with holes that are perfect for spreading the flow of your filter. Of course, go for the ones with suction cups.

  • Block the flow with plants or decoration. A well-planted tank will provide a safe place for your betta, away from the mean filter flow. You can also block the current with rockwork or artificial caves.
  • Drill holes in the intake pipe of your filter. This is simple physics. More holes or a larger intake pipe will reduce the pressure and therefore slow down the flow current.

Note: It has been the case that I get asked if Betta fish need a filtering system quite often (more than I would like to admit). Betta fish produce waste and do need filtration.

Canister filters still hold the #1 place when it comes to maintaining decent water conditions.

If you’re planning on getting one, use a spray-bar as an outlet.

These filters provide a strong flow rate, which needs to be spread out when dealing with long-finned fish.

Browse some options and mind that you should not use them in aquariums with less volume than 10 US gallons.

6. Water is too cold.

Naturally, as with any other cold-blooded creature a Betta won’t tolerate cold water.

They are tropical and thrive in waters with a temperature of 75 to 82 degrees Fahrenheit (24 to 28 in Celcius).

If the water is too cold, your betta’s metabolism will gradually slow down.

This will cause the fish to become lethargic and spend a lot of time at the bottom of your aquarium.

Slowly raise the temperature if you think this may be the problem.

If by any chance the aquarium does not have a heater do some quick research on the best heaters for tanks that hold between 3 and 10 gallons of water and get one as soon as possible.

7. Its water too hot.

In summer an aquarium can get really hot.

Warm water releases oxygen too quickly which may leave your Betta gasping on the bottom.

Though Betta fish possess a special organ called Labyrinth, allowing them to breathe atmospheric air, they still may die if the water is poorly oxygenated.

In this case, you have to lower the temperature and add some extra oxygen to the tank:

  1. Lowering the temperature – DON’T use ice packs or ice cubes in the water.

    The sudden temperature change will stress both your pet fish and the beneficial bacteria in the aquarium and, perhaps, even kill them. What you can do is place a fan to blow directly on your aquarium’s water surface.

    Another (obvious) solution would be air-conditioning the room. You could also eliminate any direct sunlight reaching the aquarium.

    Don’t keep the fish tank lights on for over 6 hours, which should be more than enough for your aquatic plants to grow. Note that LED lights emit little to no heat, so get one of those if you have the chance (hint: the link will help you with that).

  2. Oxygenating – Use a small air pump to help with bringing more oxygen to the fish tank (Chewy.com has some durable ones for under $10).

8. Old Age.

Betta fish can live a happy and healthy life for about 4 to 5 years with good care.

Some may live even longer, but after hitting the 5-year mark they will become lethargic and more susceptible to disease.

Older Betta fish won’t have that youngster energy to explore. They will prefer laying around on leaves or the bottom of your fish tank.

Leave the elderly to peacefully reflect on their past.

9. High ammonia levels.

If your betta seems as if it’s gulping intensively while laying on the bottom then the fish tank may has an ammonia issue.

Ammonia spikes can be quite deadly to aquarium fish, so you need to confirm this as soon as possible.

Confirming an Ammonia poisoning is really simple – test your fish tank’s water. An excellent way to consistently monitor the ammonia in a fish tank is using Seachem’s Ammonia Alert sensor. It accurately tracks ammonia levels continuously and it lasts for almost a year, which is impressive, given that it only costs around $7.

Finding the roots of the problem, however, can be more complex. A couple of reasons for high ammonia may be:

  • An overstocked tank – the fish produce too much waste for the beneficial bacteria to handle.
  • Overfeeding – again, food waste turns into Ammonia.

    Monitor how much your betta actually consumes and offer less food than it can eat in one feeding session.

    Good prevention of overfeeding is getting an automatic feeder.

    It will feed the fish just the right amount, even when you’re out of town.

    I can recommend this one on Chewy, as it’s an Eheim and it seems to work consistently.

  • Incomplete tank cycling – you’ve added the Betta before the aquarium was ready to harbour live fish.

    Tank cycling is when you leave the beneficial bacteria enough time to develop a colony. In return, they will transform the dangerous ammonia levels to the way less harmful Nitrates.

    A fully cycled fish tank shows readings of 0 ppm of Ammonia, 0 ppm of Nitrite, and 10 or more ppm of Nitrate.

    Full natural cycling takes no less than a month.

    You can speed that process up to just about 2 weeks if you’re using bottled bacteria to kick start the Nitrogen cycle (learn more about that by clicking the link to see the guide I wrote).

The good news here is that you can almost always fix high ammonia levels by water changes.

Your initial water change should be no more than 50%.

Dechlorinate the new water before putting it in the tank by using a water conditioner such as Seachem’s Prime and continue to perform a 20% water change every week.

10. Stress or Disease.

There are a number of diseases that put a fish on the bottom of its tank.

Due to the way betta fish are bred their immune systems are weaker than most fishes’ by definition.

If you haven’t found the solution to your problem above in this article then I have bad news for you.

If hanging out at the bottom is combined with atypical behavior, loss of coloration, cloudy eyes, inflamed fin patches, etc. then your betta is probably sick and you should definitely be concerned.

All of these symptoms alert something more than a lazy personality.

If it’s a female betta with a swollen belly and you’ve concluded it’s not constipation then it may mean that the fish is eggbound.

Sometimes this condition sorts itself out, but not every time. If that’s the case, then little can be done.

Note that this is just one of the reasons for a bloat in Betta fish.

Anyway, if you suspect an infection then treating with Epsom salts can be beneficial.

You can also let some Indian Almond leaves sit in the water.

They will release tannins, which help with infections and strengthen the immune system of your fish.

Make sure your water parameters are in check.

A stress-free environment for your betta can also make the difference. One quick yet absurdly efficient way to reduce stress levels in betta tanks is by adding up some live plants.

These will artificially recreate the betta’s natural environment which may be a significant help in keeping stress at bay.

I recommend the addition of surface water plants that remain afloat if you think your betta may be stressed out. They filter the aquarium water from excessive organics, provide interesting surroundings for exploration and also get as close to the betta’s native rice paddies as possible. Oh, and they look great.

11. Its Aquarium is too small and the fish feels confined.

If you’re keeping your betta in anything under a 3-gallon tank, then it may be time for a change.

A 3-gallon tank is a BARE MINIMUM for a Betta fish. Ideally, you’d have yours in a 5 or 10-gallon tank.

An argument to upgrade would be that smaller tanks are very difficult to keep in check.

Each small change in the water’s parameters can immediately throw the whole system off balance and your will Betta have nowhere to retreat.

“Dilution is the solution to pollution.”

Anyway, another point I’d like to make is that, as mentioned above, Betta fish are curious, and also like their private space.

When the aquarium is too small and there’s no space to explore or retreat to the stress may start to show.

Your betta will lose its life spark and prefer to do nothing than staying on the bottom.

Remember that in their natural habitat betta fish have a ton of vertical space to swim in.

They are found in rice paddies and though shallow, these always provide more room to discover or a good hideout.

So, in case your betta tank is no more than 2-gallons in volume I would strongly suggest that you consider getting it a larger home.

Make sure the new place has LOTS of plants as well.

I can help with choosing the right aquarium with this guide.

Good luck.

The larger ones also give the opportunity to house more than just a betta.

Conclusion

To witness a betta peacefully laying at a fish tank’s bottom is not uncommon.

It’s all about knowing your fish and its habits.

Carefully monitor its behavior and conclude whether it’s just a way of living or an issue in disguise.

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Marble

My Betta must be really lazy.
He has two fins a centimeter underneath his head that are curled up and he doesnt use them. Im a bit concerned, but just got him yesterday and he might need a larger tank. FYI he is in the cup, Im transfering him today.

Marble

Ok transfered him and he just didnt have enough space, but found hims sleeping this morning, He was hovering a centimeter up from a flower decoration! ^^

Sam

My beta has been sitting on the bottom of the tank for a while. I think it was because my original fish tank was quite small, so I properly moved him to a bigger tank with a filter, heater, and just the right amount of decorations. But after over a week, my beta is still panting on the bottom and still moving very little. What does this mean? I’ve tried many things to get my beta back to moving again, but nothing seems to be working. He does not seem to have any of the diseases you listed, so what… Read more »

Quinn

Hey this happens to me you can try to put some aquarium salt in a separate tank, Since they’re in little tiny blocks you’ll need to wait for them to resolve with the heater and then you put the verification for just a couple of minutes maybe 5 to 15 minutes and then you put them back into their original tank and don’t put any salt water in there you can do this twice in one day but probably in the morning and night time and see if this works but never do it too much this can help with… Read more »

Jennifer

Thanks for the informative post – I lost my first male betta due to ammonia poisoning (big rookie mistake but I’ve learned a lot since then). I now have 2 male bettas (each in a 10g tank of their own, with an abundance of live plants, filter, heater, ornaments to rest on etc.) and I’ve kept them going strong for over a year. However, I am now having issues with both of them, and I really can’t figure out why… The first is Mr Bubbles, he’s on his own with a couple of nerite snails because he’s ultra grumpy and… Read more »

Emma

This is exactly what’s happening with my fish at least the second fish Mr.Lawrence, my fish is lying on the bottom of the tank looking constipated and is not getting better. Tried a pea, even out him in a separate tank. I have been feeding him, and even asked my family memhers. So please help me!

Marion Clark

Hi. My son’s fish was fine unril we recently added a bloodworm to his diet. He is at the bottom on his side. Samuel Finn has been with us for 8 months. We love his friendly little personality. He comes to the top happily at feeding time and when we speak to him. He has a 10 gal tank with a heater and filter. He will swim around if he is touched with the net but then returns to the bottom. He’s a little better today since we did a partial water change. He was uniterested in eating last night… Read more »

Emma

I tried the pea, almost the exact same thing is happening to my betta, silgar. So please if you find out what’s wrong tell me! I’m really worried about my fish.

Rosa

My betta has just recently started lying on the bottom of the tank and his fins are vey clamped and he seems to be struggling when he swims. And he seems to have these white dots on him. We don’t have a filter in my tank maybe that’s why? But other than that I don’t know what I’m doing wrong

Natalie

Hello, my Betta fish has been happy and healthy since we got him up until a week ago where he’s been laying on the bottom of his tank flat or on his side and going up for air every now and then, he won’t eat and I’m very concerned. His belly seemed bloated and he’s very inactive and advice on what to do??

Kim and Mark

My husband and I have gone betta crazy. We have bought “rescued” 20 betta in the last year or so. We received 5 new wal Mart bettas this weekend there are 3 who lay at the bottom of their tanks. (2 5 gallon tanks with dividers and a 20 gallon with dividers.) They have been fed frozen brine shrimp and bloodworms which they happily accept. I have not encountered this before. Should I be worried about them, could it be swimbladder issues? Any helpful info would be much appreciated.

Apple

My betta dosen’t sit at the bottem but rather in/under plants or behind his filter. He swims around when I walk in or interact with him and feeding time but I usually see him laying or leaning on things like hes dead. When hes not doing that he acts like a normal fish would but he does this LITERALLY 90 percent of the time 🙁

Apple

Now I notice him floating to the top and having a hard time swimming

Owen

My Betta is at the bottom of tank moving around for a little then stops for a bit then moves around more, only stops moving behind a plant