Molly Fish Sits On The Bottom And Got Bend Tail

[dementjeva]

Hi,
 
Got a problem with a Molly fish. She been behaving weird since we got her about a month ago, but now she got a band tail and she sits on the bottom of the tank and dont move, unless for food. 
 
Tank is 30L and got 4 fishes in it. pH is 7.0, ammonia 0.6, NO3 is 50 and NO2 is 0.8. Doing daily 10% water change. Only feed fishes once a day to reduce pollution.
 
Read that this could be caused by inbreeding. Please advice.
 

 

[Munroco]

Looks deformed for sure, and as you say very possibly through inbreeding. Nothing you can do for her I'm afraid. Just make sure she's getting her share of food.

 

[Guppy_molly_love]

I think changing water every day is too much. Try changing it twice a week(?)
I change the water in my tank twice a week.

 

[fluttermoth]

I think changing water every day is too much. Try changing it twice a week(?)
I change the water in my tank twice a week.

 
In some situations, daily, or even twice daily cam be the only thing that can save the fish. As the OP had (this thread is nearly a year old, and the OP has never posted again) significant levels of ammonia and nitrite, both of which are highly toxic to fish, daily water changes, of more than 10%would have been the right course of action.
 
In general, there is no such thing as changing too much water; there are a few exceptions, like when you're dealing with an old, neglected tank.