I'm planning on getting the magnum 350 with the bio wheel attachment when i get my 75 gallon tank. I only have a 10 gallon now currently. I've read nothing but good things about the magnum. The only thing i'm leary of is assembling the intake and exhaust pipes. I don't really know if i have the gonads to drill through expensive acrylic that i'd just have bought, or if there's a different/better way to do it. That point is moot though, since i don't have a giant tank yet., Hopefully i'll have one by autumn. I'm getitng married in july and i'd get killed if i blew cash on a tank before then.