Should I buy anything else?
Try the pygmy angel formula by Ocean Nutrition (frozen food). All angels need marine sponge in their diet, as well as other meaty foods and some greens. Offer the angel as wide a variety as possible. You might also consider making your own food with fresh seafoods, nori, and viatamins.
Mike the Half black is C. vrolki, the bicolor is C. bicolor. Do a google imagaes search with the Key wors "Centropyge vroliki" and check it out, IMO
, it is not the safest fish to put in a reef...but it is beautiful.