I have the Rena XP4 on my 55 right now. Even with my dirty fish, the water is crystal clear. I would have gotten the XP3 though except that I am looking to step up to a 120+ gal tank and prefer to over filter everything.
star_fire;4416473; said:http://www.bigalsonline.com/BigAlsUS/ctl3684/cp17290/cl0/canisterfilters?viewType=Category
there is a big sale on right now for canister filters!