MEIN GOTT IN HIMMEL!!!!!!!! 22?!? I must bow before greatness, then. At my peak, I had six going at one time. Different aquascapes, different co-habitable species, etc. (I always wanted, but never did, set up a tank of discus. Beautiful fish.) I used to be a part-time tank tech at a pet shop eons ago - I can only imagine what keeping almost two dozen maintained must be like.