I wouldn't worry about it starving... I mean really, how many stories are there out there about an OSCAR starving to death? lol
You need to just change his diet, and for me the best way to do that with an oscar is to wait several days before feeding him, and then feed him the desired food.
I mean, lets be real.. It's an oscar. Oscars and food go hand in hand. Just give it time and eventually he will eat whatever it is you offer to him out of desperation for food, until the new diet is just what he's used to.
You need to just change his diet, and for me the best way to do that with an oscar is to wait several days before feeding him, and then feed him the desired food.
I mean, lets be real.. It's an oscar. Oscars and food go hand in hand. Just give it time and eventually he will eat whatever it is you offer to him out of desperation for food, until the new diet is just what he's used to.