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Cryptocoryne aponogetifolia is found in abundance along the edges of fast-moving rivers and streams on the island of Luzon in the Phillipines. The substrate is mostly basaltic rock and gravel from nearby volcanos (some still quite active) mixed with limestone.

Leaf margins are frequently wavy and the leaves may be bullate (have a blistered or dimpled appearance). There are at least 15 different 'varieties' named on the basis of leaf shape and color.

Overall, it is difficult to plant Water Sprite incorrectly! Whether grown with its roots in the aquarium substrate or simply left floating, this fern will generally thrive in most aquariums.

Often confused with Schistura subfusca, which is not found in the same river as S. mahnerti, the Burmese Border Loach has a light gray to silvery background color and up to 17 darker vertical bars, the anterior ones being vertically split.

This fish prefers a heavily-planted aquarium and does not much appreciate robust or overly aggressive tank-mates. It is decidedly predatory in nature and smaller fish are not safe in a tank with the Leopard Ctenopoma.

Phenacogrammus interruptus is the most commonly available African tetra and it is a real joy to have a school of these fish in an appropriately large aquarium. Properly lighted, their colors are unmatched by most freshwater fish.

The fish of the genus Polypterus and the related genus Erpetoichthys are widely considered to be 'primitive fish' or 'living fossils'. In fact, a number of large pet store chains are now selling Polypterus senegalus under the name 'dinosaur eel', a reference to their primitive nature and their snake-like structure.

The Ceylon Combtail is commonly found in the shallow water of clear slow-flowing streams and rivers of Sri Lanka (and occasionally in ponds and lakes).

The exotic appearance of the African Butterfly Fish has made it an aquarium favorite since its introduction to the hobby in 1905. One of its most obvious characteristics is the broad span of the enormous pectoral fins which resemble the wings of a butterfly (and from which it gets its name).