It's a Ball and that's pretty much how they are. Mine hides if I go in the tank. I pull her out.... She balls up. After a few minutes she relaxes and hangs around with me without issue. That's just how she is. I don't try to change it, don't think it can be changed, and don't care to change it. It's in her nature and I don't care to fight with nature. I'm not hurting her and she's not doing anything uncommon so I don't see it as a problem.