I have several Angel fish in a fairly new 90 gallon tank and most of them are fairly small in size. I have an air pump at each end of the tank in the top corners and a Rhena canister spray bar along the top of the back wall. There is quite alot of current/movement throughout the tank and I notice that in quite a few places the angels seem to struggle to swim. There is alot of bubbles in the tank all the time and I'm wondering if there is a problem with too much air and, is there such a thing as too much current for angel fish? Please advise. Thanks!