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I just bought about 6 zebra danios and a few of there bellies are huge. They eat good, swim around and are very active. What could this be?

55gal Tank:130 watt coral lights,Eheim Wet/Dry 2227 Canister Filter,Powerhead, Co2 Injection and a heater.

It could just be overfeeding, maybe try not feeding them quite as much for a couple days and see if that fixes it.

Maybe pregnant? Check to see if the fatter ones are females.

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Ive had them for about 2 weeks and they have been like this the whole time.

55gal Tank:130 watt coral lights,Eheim Wet/Dry 2227 Canister Filter,Powerhead, Co2 Injection and a heater.

I posted this same question a few weeks ago as I have 3 Danios that have huge bellies as well. Thought maybe pregnant but guess not as it has been weeks and weeks wth the big tummies. I do not overfeed either so I guess they just are bigger Danios. I have had them for over a year so maybe they are just happy and well rounded. LOL

There are a few parasites that can cause distention of the belly, roundworm among them, and fish can live a long time with such infections. If the condition isnt too bad, but they eat a lot, and dont seem to be heavy anywhere else in the body that is always a possibility. Look at the tail and in fleshy areas immediately behind the top of the head, if those areas are plump and solid, its just weight gain, if those areas are sight and lithe, and just the belly is large, there could be a problem.

Could well just be what your seeing is the difference in the sexes, females are more e to weight gain, and broader body dimensions, and periodic gravidity is also possible, although you may never have seen a spawn since they will often take the opportunity to do the deed in private, and in community the eggs are often eaten without a trace being left.

Periodic constipation is also possible, and if you think that may be the case , try offering some blanched mashed peas or garlic, and see if you can get things moving.

Whats the diet youve both been feeding your fish BTW?

I feed them TetraMin Tropical Flakes twice a day and on the occasion Freeze dried blood worms. I tried to take pics but not that great, maybe you can see what I'm talking about.

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55gal Tank:130 watt coral lights,Eheim Wet/Dry 2227 Canister Filter,Powerhead, Co2 Injection and a heater.

They look fine, just a little tubby is all.