I just switched tanks last weekend and everything went well. Went from a 90gal acrylic to a 75 glass tank. My question is that with the less height i have now in the 75 versus the 90, is my 1 Tunze 6060 powerhead too much flow for the fish to handle, they seem to be hiding quite a bit more and swimming less out in the open. Is it possible to have too much flow?