Oscars God i luv them! But a basic rule is they will TRY (and i mean that in all sense of the word) to eat anything, i once had to take my oscar to the vet for trying to eat a whole 15cm plastic plant! i've had them with large 12" plecos and it's only the plecos naturally boney planted back that protected it although they still tryied to eat it! so i had to take it out in the end! best thing is to keep them on there own or with other more interesting oscars e.g tigers/albino/reds etc etc
hope this helps
