Well if he is just getting a 5 gallon I wouldnt add anymore fish in with him, you could possibly add a Apple Snail since he cant see he wouldnt pick at him like a normal Goldfish would. How old is the fish? You might think he is stunted but he could grow well in a tank by himself and get much bigger. Also just fasting your fish wont help. What kind of greens do you feed him? All my fish love when I give them peas so i cant understand yours not. As for him not finding his food Goldfish find food by smell not sight so he would have no trouble even though he cant see.
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10 Gallon
60 Gallon Tank
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