AQ is light handed.They will not let you get 100% without saying you are 125% stocked.They error on the side of caution IMO
I appreciate their compatibility and temperature info but as far as crowding fish go they try not to let you get carried away.
Their estimate of stocking level is based on full size fish so there is clearly room to grow if you have smaller fish...
I kept my 180g stocked at 220%[according to AQ] for 3 years before loosing some fish.Even with that they say that 11 of my fish have my 180 overstocked....These fish are 12-16 years old with me and have a possible 50 year life span so IMO
they have not grown to full size and the tank is not over stocked as they say..
Make sure you keep up on weekly water changes. Your fish will not 'outgrow' your tank the 'overcrowding' is all about water quality IMO