ive seen people breed RDxFH, it turned out great, ive started off with Rd and fh, and they did breed once, but ive never got to see the frys, think someone was messing with the tank while i was away so the eggs were gone. if breeding, rd and fh is what you really want then go for it, its your fish you can do whatever you want with it regardless on what people say. all i can tell you is that both are great fishes. GL.