Anorexic Figure 8 Puffer. Help!
I have three Figure 8 puffers in my tank, and two have these big, round bellies, which is healthy for them. The third had one a while ago, but he's SO scrawny now! I've fed him flake food, blood worms (live and frozen), black worms, pellet food, etc.--I've tried a lot of different types of foods. His behavior seems unstressed aside from the whole "not eating" thing. Any suggestions?