The sick fish is an Apistogramma Cacatuoides. He is quite young. Recently he has started swimming on his side, like he was leaning over. this has been going for a few days and has gotten worse today. he now lies on the bottom or very close to it, although he is still lively and is capable of swimming normally when he wants to- like seeing the food container pass the tank. Usually he isnt active at all though.
I thought it may be swim bladder but he can swim normally + he wont eat peas.
Note that i did upgrade from an internal filter to a canister filter. The canister is a bit oversized for the tank and i thought the increased flow was tiring him out. Is this the case or has anyone heard of this happening??? I did keep the old filter in the tank so the canister would cycle.
The tank is 3ft long, 120l. Thin layer of gravel. Large piece of driftwood with java fern all over it. I have only peaceful fish like guppies, tetras, and corydoras. Waterchange every week, 15-25l, use a gravel cleaner everytime.
Anyone know what i can do to help him?