So when I was away at school my mother starting feeding frozen silversides and live goldfish to my Oscar instead of my staple Bio-Gold diet because "he refused to eat the other stuff". So now I'm home for spring break and he absolutely refuses the Bio-Gold. I try dropping a pellet in the tank, he takes it in his mouth then spits it out and eventually gets sucked into the filter. I've tried feeding him nothing but the Bio-Gold for 5 days now and still no luck. I'm getting worried now because he's starting to go after my bichirs 
What should I do?!
What should I do?!