I have a 20 gallon tall tank and I am planning on building a stand for it this weekend. The stand will be made to accomodate the filter so I would like to know what kind of filter would be best for my tank before I build the stand. This will be a heavily planted tank with some tetras and a gourami. After some research, I learned that plants do a majority of the filtering in an aquarium and the neon tetra like a calm water. So it seems that i would need a filter that does mainly mechanical filtration and one that does not produce a lot of current. correct me if im wrong. I currently have the HOB marineland biowheel 150 that came with the aquarium kit. Will this be enough filtration? too much? should I go with a canister instead?