# Red Butterfly Goldfish The Red Butterfly Goldfish is a descendant of selective breeding programs that date back centuries in Asia, where goldfish were first domesticated from wild carp species. What sets this variety apart is its distinctive flowing fins?those characteristic "butterfly" wings that extend from its body like graceful sails. These fins aren't just for show; they're delicate structures that require thoughtful tank design. Avoid sharp decorations and rough substrates that could snag or tear them. Instead, opt for smooth gravel, sand, or river rocks, and choose plants with soft, broad leaves like anubias or java fern if you want greenery in the tank. These fish are curious and interactive, often recognizing their owners and gathering at the glass during feeding time. They're bottom feeders by nature, constantly sifting through the substrate in search of food?a behavior that stirs up detritus and helps keep the tank active. This means you'll actually see them *doing something* throughout the day, not just drifting. Red Butterflies are social fish that do well in groups, though they'll also thrive alone. They're compatible with other peaceful goldfish varieties and won't harass community tank mates, though they may uproot softer plants while foraging. Plan for growth?these fish can reach a foot in length and produce substantial waste, which means your 20-gallon minimum is truly a minimum, not an ideal setup. They prefer cooler water than tropical fish, making them excellent candidates for unheated tanks or rooms without temperature control. With proper care and a spacious environment, a Red Butterfly can live two decades, making it a genuine long-term commitment rather than a temporary aquatic companion. Their longevity and relatively low maintenance needs have made them reliable favorites across generations of aquarium keepers.