hey hey my previous blue ring did not reject any food i give him, even for market prawn meat. IMo they are rather hard to keep as their life span is very short and do not do well in captivity. BTW they are excellent escape artist and can squeeze through any small gap so if you intend to keep them, make sure that tank is escape proof. BTW blue ring are not something to mess with and i don't encourage anyone to keep them. I regret keeping mine but at the same time i cherish the time it has been with me.(6 months plus)