Check out the GPH ratings that someone else had done for the 2217, it may sway your final choice:
http://www.plantedtank.net/forums/showthread.php?t=120979
Roy over on aquariumadvice (been keeping discus for a while) said this: "If that's my tank (75g), I'd get 2 fluval 305s or a 305 and a 205, or 305 and an AC110."
http://www.plantedtank.net/forums/showthread.php?t=120979
Roy over on aquariumadvice (been keeping discus for a while) said this: "If that's my tank (75g), I'd get 2 fluval 305s or a 305 and a 205, or 305 and an AC110."