I found one of my stock black D/D (double black) angelfish dead this evening, these angelfish our the offspring of Frank the dangerous killer angelfish, which has decided in the last 12 months to kill anything that he shares an aquarium with.
I have read and discussed with other angelfish breeders, that D/D angelfish have a “killer gene” which makes them slow growing and die easily, due to the dark pigment colouration.
