Biotope aquarium
A tank set up to copy one natural habitat, with only the fish, plants and water of that place.
Also: biotope
A biotope aquarium recreates one real place: a blackwater Amazon stream with leaves, roots, soft acid water and tetras, a rocky shore of Lake Malawi with hard alkaline water and mbuna cichlids, or a hill stream of the Western Ghats with pebbles, fast flow and barbs and loaches. Fish from the same habitat usually share water needs and behave more naturally. Biotope contests reward accuracy as well as looks, and the approach has spread interest in the wild habitats of aquarium fish.