Originally Posted by cowboy3dc
He only had a problem after a few weeks in this tank idk whats happening i do a water change every week
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Hun, we're telling you what the problem is, you're just not listening. It's tank size. Pure and simple. You must have a larger tank, even for babies of those types of fish. Must, must, must or you will have very dead fish. They need THREE HUNDRED GALLONS...and that's JUST for the catfish.
If you don't have that kind of room or money for it, or a very large pond, unless you want him to die you should find him a new home, same with your bala sharks since three of them would need...oh jeez, 200 gallons or so I think is right for three, one need 75 gallons as a minimum but they don't do well if not in pairs as you probably know having gotten three of them. 200 gallons is not, however, ok for the redtail catfish.
That's because in that small tank, he's going to be cramped, and eventually stunt. Stunting happens quick for fast growing fish. Their organs continue to grow, but their bodies stop or slow...and eventually, SLOWLY, the organs are crushed by the smaller body.
Right now, if the fish hasn't started stunting yet, the likely cause for his actions is being in a smaller tank with a bunch of other fish all requiring more space. He's crowded, he's in a tiny area, and he's not liking it.