Ive had my valentini puffer for around a few months now. He ever only ate the clams but not flakes or shrimp. So he would only get fed once a day. But all of a sudden i accidently skipped one day which has happened many times, hes always hiding, never trying to eat, and always sleeping. I didnt change anything tank parameter whise. I did move rocks around to try and net a fish out. Any help? How long can he go without food? Its been 3 days. The clams where his diet ever since he existed. He also just came out a few minuites ago and instantly rubbed on the rock then hid again.