I have 6 black skirt and 3 white skirt tetras in a 29 gallon tank. One of my black skirt tetra is fat. I did give it medication and it did help now it is not bloated from the sides. I do fast the fish for 1 or 2 days. Everytime I feed it she bloated badly. What does this look like? What can I do? The water in my tank is fine. The readings are fine so don't ask that.This is my biggest fish it is huge for a black skirt tetra. This is the only fish like this Thanks