not really, when having mostly small schooling fish, a good rule of thumb is 1 fish per gallon of water, so i'm at about 2/3 that ratio

filtration is a rena xp3 which is made for upto 175 gallon aquariums.....overkill i know, but when i bought it, they were out of the xp2 that i actually needed that was for upto 75 gallon tanks (& i got a killer deal on it)