My mum calls my serpae tetra “gimpy” because he swims in a weird manner. I’ve researched and he doesn’t swim like he has a bladder diseas but he has a tough time staying upright. Every time he swims, his lower back falls and he has to twitch back up to be straight. Is there something wrong with...
He seems to be fine with the other fish. Both cardinals are big enough to not be eaten. But this guy, Timothy, is a lot larger than the other, Jill. Would it be a good idea to get more cardinals so they can be in a school?