I know tank size, aeration and filtration can be a big part but...whats generally too many? I just love getting new and different fish but know that I must stop. I know i have a larger tank coming in the fall so I am trying to figure out how many fish I can "safely and uncruelly" keep in my 320g. Between now and the fall I know the fish i have may get quite larger so i have to consider as well. What do oy uguys think is too much with good filtration?