Normal behavior, give him some time an he'll get comfortable. Mine charges the glass and begs for food if I pause in front of the tank. He'll lay low, then do a few speed laps with the power head. Never misses a meal though. Be patient, good luck.
125 gl (72.5x18.5x22), 33 breeder tank sump, 3 maxspect led, Diablo protein skimmer, 1"live sand base, 175lbs live rock, 2 Orange Clowns, 1 yellow tang, lawnmower blenny,several mushrooms and leather corals, a couple small acro's and a standard cuc. Tank transferred from 55 on 24 Dec 2011