I got a banggai cardinal 5 days ago and I've been feeding him little by little to see if he would eat the frozen food, which he always did. Today, he refused to eat any of the food given. Some of the food dropped literally on his mouth and he just turned the other way. Any help on this? I am feeding him brine shrimp, I tried feeding mysis shrimp on the previous days, but he refused to, but would always eat brine shrimp. Any tips on this?