I had a CPR HOB filter/skimmer on a 55gal yrs ago pretty nice setup I really liked it. Only drawback was my crazy Chain link eel loved going in it, and causing the water to overflow all over the floor! Lol I don't do eels anymore, unless its a garden eel. I don't think you can go wrong with a CPR unit, did you decide on a skimmer yet, I like the reef octopus brands, I run a space saver model where the pump sits inside and under the unit.