dude i would go with the rena canister filters they are great i have one on my 55 i think its the xp2 and its rated for 300 gph i got it because i alos used marineland bio-wheel but when the water level would get low it would make so much noise so i got the rena and over night it cleaned the water to a crystal clear finish, haha and there was no noise from the evaporation, all in all its a good filter i only used it for mechanical and bio ( i used lava rocks) media and then i would use one of my marine land bio-wheel 330 with some carbon that i alos where i would put medic to get it turned up by a small powerhead. I would leave one chamber empty that would only be used for dosing and treatment, but i took down that setup and just started to use my marineland bio-wheels agian and i must say over time the bio-wheel filters work great and keep the water crystal clear, i also solved the noise problem from evaporation by adding an aquaclear spong infront of the return of the bio-wheel and no more noise but when it got really low then there would be more noise but all in all i think rena would be a good filter or those ehiem canister filters i think one of the ehiem comes with a built in heat, wait yes one does but cant remember the model but its pricey, hahaha