my powder blue tang this morning was acting very strange. he wasn't eating off the clip and wasn't swimming very much. he would just hover in the middle of the tank lazily darting back and fourth. his colors were darker than normal. it may be nothing but this fish is very important to me and i dont want anything bad happening to it. the ntang also fought a little with my emperor angel on Saturday and got beat up pretty bad but he was looking normal monday and was eating better than ever. the perimeters i have not checked yet but i will hen i get home. all the other fish are looking great.