Oscars are real messy eaters had one big one he used to spit his food back out all in the water.What are you feeding it,I fed mine a lot of tetra jumbo krill.
I keep it on a mix diet of BloodWorms,live Fish and Hi-Red Pellets.
If it doesn't it wht u giv it,still keep feeding it that in very small amounts,gradually within 2-3 days max,it will get adjusted 2 ur new food.
Reply if this works.
Yusufi...