when i used to keep aros (blacks, jardinis, silvers), i would train them to eat hikari food sticks. when they were little i would break them into 2-3 sections. keep it up, and they will take it. they will eventually get hungry enough and accept it. if it is a while (1 wk), throw in a couple feeders, then you can start the process again. don't give up.
I did not have to starve her/him.