I have a juvenile blue hippo tang which has been behaving really skidish lately. for one it has been hiding in a small crevice during daylight hours which it has never done before in fact it used to come to the glass and almost greet me, now it seems to be fearing me. Also when it isn't hiding it will come out and make really abrupt, fast, changes in direction. Furthermore it will also swim up and down the glass in one corner in a very repetitive motion. All my water parems are stable and there is no obvious signs of parasites on the fish. Im also getting even more worried as he is beginning to miss feedings because hes hiding or acting wierd. Whats going on? this fish used to have such a good personality. total change in behavior?