Some egg yolk hard boiled in a pipette like brookster said might me a good place to start
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That might work has he been eating that you've seen
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micro worms are the best thing to feed them
or golden pearls, ( Golden Pearls 5-50 Microns)
Wouldn't worms be high in protein?
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Crush pellets up small enough that the rest of the fish will ignore, or drop him some gel cubes. Either diy or go buy some, omega 1 makes them along with quite a few other companies. That would probably be your best bet if he's scared to come out and get eaten, just drop 1 in his little hideout and let him munch away...
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