As far as fish and inverts are concerned-i'm understocked in both tanks 35gal hex and 75gal, though I have a sailfin and yellow tang that will be soon combined in a 125gal reef tank as i'm sellling the 75 gal. Don't know how they will get along!? Corals on the other hand are getting pretty crowded, especially in the 35gal hex. I need to stop buying so that the corals I have now can grow and spread/multiply. Can't wait to get the 125 set up and put all the inhabitants of the two tanks into one bigger one!!!