Halfmoon Rosetail Betta The halfmoon rosetail betta, or halfmoon rose petal betta, is an amazing variation of betta splendens. These fish come in a variety of color patterns, but all have fins so large that they fold over on themselves. The folding of the fins gives the fish its name, since the folds resemble the petals of a flower.  There are many names for the particular betta color patterns but most are variations of blue and/or red colors. Fish pictured here are representative only. If you are looking for a specific coloration, please note on your order, or simply allow us to choose one of our favorites for you! Scientific Name: Betta Splendens Origin: Asia Lifespan: 4 years Max Size: 3 inches Food: Flake, Live, Frozen Shipping Size: Approx. 2 inches