Well I picked up a mystery snail and 2 ghost shrimp...so I have 3 tetras 3 mollies 1 cherry shrimp 2 ghost shrimp 1 mystery snail in my 10g...probably too much..the mollies do make the tank active...im gonna pick up fluval 16...i like the Aqueon frameless...i just don't trust the 20 gallon frameless on this stand...