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The Neon Tetra is a brightly colored small fish. They rarely exceed four cm in length, averaging one and a quarter to one and a half inches in length, with males being slightly smaller than females. Females also have a rounded belly, while males are described as being more 'straight'. They are named 'neon' because the blue green line that runs from their eye to their tail reflects in a way similar to neon. The female's line will have a noticeable kink in it. The function of this line is to allow other Neon Tetras to see each other in dim or dark waters. The effect of this line in an aquarium is nothing less than beautiful, particularly when they are schooling. The body of the Neon is brightly colored, with a silver fronted lower body. Their fins are typically clear, though the base of the caudal fin is a brilliant red.

The Thorny Devil is a moderately sized lizard, averaging between 15 and 20 centimeters (about six inches) in length. They are covered in thorny spikes and grooved skin. They have a knob resembling their head on their back, which they expose when threatened. The Thorny Devil's tongue is very sticky and fast moving, unlike the rest of the lizard, which moves quite slowly. Many people believe the Thorny Devil resembles a miniature rhinoceros.

Black Sharks are large fish that average 20 to 24 inches in length, though individuals as large as 2 feet have been documented. Male and females are not visually distinct, and this is one reason why captive breeding is difficult.

Chinese Water Dragons are lovely green lizards that appear to be mostly tail: the striped brown and green tail makes up about three-quarters of its full length. Males grow to be about three feet and females about two feet long, though some females can grow as larger, or larger than males. They are green with vertical stripes of a contrasting green color.Green Water Dragons have colorful throats, ranging from pink or peach to brighter shades of orange. They have triangular heads and a small shiny spot between the eyes, which Water Dragons use to thermo-regulate and sense light. The hind legs are more muscular than the slim front legs, and like us, Water Dragons have five toes. They have sharp claws and the middle toe is the longest toe. It is difficult to visually distinguish between the sexes and nearly impossible until the Water Dragon is sexually mature, though generally males are larger and have more pronounced heads and jowls.