For a HOB
power filter, IMO
, the Emperor 400 is top of the line both in filtration capacity and quality. For a canister, the Eheim filters are probably the best available. They aren't cheap though. Since you have a planted tank, a canister would probably be best as it wouldn't disturb the surface as much. That will help keep the C02 levels up where they need to be for the plants. I agree that the Marineland canisters are good filters. They have one shortcoming IMO
. Unless used in conjunction with a bio wheel setup, they lack good biological capability. Running them with a bio wheel gives them excellent biological capability, but also increases surface turbulence and diffuses C02 out of the water.