Golden Angelfish and other finicky eaters

[tytown]

Any tips on getting picky eaters to eat?
I bought this golden angel a week ago and only because he looked very healthy and was picking at the rocks and glass in the FS. The only one i've seen worth actually paying the price for.
Ive tried spectrum, brine shrimp, sea weed, spectrum w/ garlic and cyclopeeze. He only seems to be interested in the rock.
Ive read threads on this species and some have reported going years without seeing it eat so maybe once QT is up I should just wing em in!? He loooks fine, and picks rocks all day long, how important it is if he has 200 lbs of LR as alternative food source?