Hello, I have some more questions. Are serrasalmus rhombeuses, or black piranhas technically piranhas? I've heard that they are not really piranhas. Also when do these fish start to get their dark color and red eyes? Oh yeah, one more question, please tell me how much and how many times a day they need feed from juveniles until adults if you can, or just give me more of an idea. Please clear this up for me, Thank you.