Few fish can generate as much curiosity and wonder as the Glass Catfish (Kryptopterus vitreolus). As its name suggests, this inhabitant of the calm waters of Asia has an almost completely transparent body, allowing a clear view of its spine and internal organs. This unique feature, along with its elegant swimming style and long sensory…

In the diverse world of aquarium fish, few silhouettes are as unmistakable as that of the Hatchetfish. With its laterally compressed body and deep, curved chest, its shape perfectly evokes the tool it’s named after. Native to the calm basins of Central and South America, especially the Amazon, these fish are the undisputed kings of…

A group of Tropheus in a properly set up aquarium can display over a dozen distinct color variants, each tied to a specific location on Lake Tanganyika’s shoreline. In practice, that’s exactly what makes Tropheus cichlid care one of the most rewarding — and unforgiving — projects in freshwater aquaristics. Get the diet wrong and…

You walk down the aisles of your local fish store and pass by a tank full of silvery, slender, and rather plain-looking fish. They don’t catch your eye. Weeks later, you see a photograph of a fish with a red so intense it looks like a miniature salmon, or one with a perfect gradient from…

Few aquarium fish polarize opinions as much as the Convict Cichlid (Amatitlania nigrofasciata). On one hand, it’s an incredibly hardy, intelligent fish with fascinating parental behavior that makes it a gateway into the world of cichlids. On the other hand, its aggression and territoriality have earned it a reputation as an “aquarium bully,” capable of…

Quick Facts: Lampeye Killifish (Poropanchax normani) Watch a shoal of lampeye killifish catch the light just right, and you will see tiny electric-blue flashes dancing across your tank. This effect is not a trick of the camera. We cover everything below: tank setup, water parameters, diet, and the surprisingly simple breeding process for this West…