My 220g tank (6 X 2.5 X 2 height) with 65g sump currently has 2 X pBass (7"), 1 flag tail (7"), 4 silver dollars (3"). I plan to add 1 Asian Arowana (6" - 8") to this mix. I would like to keep all this fish in this tank until they are under 20". My question is, have I reached the stocking limit for this tank with the addition of Arowana? I would like to add two more pBass (around 6") if possible.