Stating the obvious to some, so please let me indulge. I move my fish around from 10 gallon to 29g. I have Corys, Otos, female Bettas and Gouramis. All of them behave better in a 29g. My water parameters aside, bigger is better. The type of landscaping is next in importance. The Corys and Otos love wide open spaces and a long run from side to side. Bettas love a jungle of plants from sub to surface to lay against between their galavants. The Gouramis somewhere in-between, seem to love quick starts and stops, parking themselves in caves or behind a leaf. So I have just received a 55gallon and am looking to devote it to corys and the like. I think I will have a corner of thick greenery, maybe anubias(?), and a nice long sandy bottom with some wood. The tank will have the light from a northeast window, and maybe some blue spectrum led (?) for accent. I don't know what color sand yet. Probably whitish. Black sand looks very nice but it isn't in keeping with the 'habitat' type aquarium. I'd love some advise please.