Robert, >>Does AquaBotanic sell or have you heard of any reactor that you can put out of the way under the tank, attatching it to a canister filter? - -- Stephen<< Yes, Aqua Medics Reactor 1000. Its a monster 15" long and 3" in diameter full of bio balls. Scott Hieber has one, as well as a few other people on this list who can tell you all about it! Robert Paul Hudson http://www.aquabotanic.com