So after my tank crashed and I have started over I have now added some new fish. All are doing very well and eating great. This little blue tang is happy and healthy with a great appetite and swims very actively all day. I noticed that past 2 mornings, he is "asleep" at the overflow? I first saw it and freaked out, thinking he was dead. He seemed to have woken up and did great all day. Ate well and was active. Again this am I found him in the same spot. Could this be a normal thing for a fish? I have never seen this, and only when the fish is close to death?