The rainbow shark has a dark, almost black fish’s body with vivid red or orange fins. Its cousin, the albino rainbow shark, sports a white body with the same fiery fins, making them standouts in any tank. Despite their name, they are more closely related to minnows than actual sharks.
FoxPix1 / Shutterstock
Rainbow sharks are very active fish and need plenty of swimming space. They are also territorial and can become aggressive, especially toward their own kind or similar-looking bottom dwellers. Providing hiding places and natural barriers like caves and plants helps minimize confrontations.