since you bought it from a chain store id put money on it that is and rd/midas mix. there is no way too tell for sure , juvi or adult, you cant tell the difference , the only way too know is if you can trace the fish back too its parents of the wild. cool fish either way i love my RD its in a 70gal and wont let any thing else in there it doesnt even like me walking past the tank. how big is yours?