I have an oscar in a 55 with a senegal bichir , they get along and I know the tank is small for these fish to be together but i really keep on the tank maintenance I do about a 10-15 WC every 3 days and clean the glass and sand but my oscar is really messy and spits food everywhere and I was wondering if adding 2 cory at fish would over load the bioload which I know is on the edge. I was wondering if my oscar would swallow them up considering their small size