Well, I'm thinking of setting up another tank proabaly a 20-30 gallon and I'd put the ac300 on it and have the mini for my QT.
Its the tank only has 2 goldies in it, soon to have 3 corys but thats about all...
40g Fresh water
1 Large Mature Silver Comet Goldfish
4 Bronze corys
1 Apple snail (growing at an alarming rate!)