Originally posted by Forum221
I always try to go one filter size too big for my tanks, for some reason i have a 2.5 gal tank with 2 Mini Bio wheels, i know this is a complete waste of filters because I think one Mini Bio Wheel is can filter up to a 20 gal tank, but i got these for a extreamly low cost for a friend at a pet store. I havent changed the water in that tank for about 4 months and its still going clean. I wouldn't recommend anything this crazy for your tank, mabye a magnum 350 or somthing would do a good job. (the 2.5 gal is only for feeder fish)