I am looking to begin setting up a 55 gallon (roughly 208 litres... maybe) aquarium, I have the look of it visualized, and I would like to have it become a central african themed tank, as I already have a small senegal bichir, and was thinking about adding the following: 1 Peters elephant nose,1 leopard ctenopoma, 1 feather finned synodontis catfish, and maybe a small, african knifefish of some kind... plus said bichir. Recommendations?
I am aware of the needs of the elephant nose fish, as it needs pristine water, which brings me to my next topic: filtration. what is the best kind? I already have a used internal filter that doesn't work super well, but still runs, and i would use that in combination with a canister, or something else...