here is an update on my 4 inch, yellow belly from Sumatra.
He has been in the tank for a total of 8 days now. He is eating spirulina flakes (he was eating this at my suppliers), formula one, and mysis shrimp. The only thing I feed that I haven't seen him eat is cyclopezee.
He is eating with some gusto. For the first six days, the only other tank mates where a male Anthias (4 inches) and a small Lamarck's angel (2.5 inches), I added two small ocelliris clowns (2 inches each) that came out of a friends tank this weekend (he had to take down his tank while he moves, other more agressive fish went into a holding tank that I have).
It seems that the increased activity in the tank has made him a little more agrressive at feeding time. This is exactly opposite from what I expected, as he had been very timid up to that point. It is almost like he figured out that if he doesn't hustle, he could miss out.