He will, should, seek out light and won't need to be fed unless he looks like he needs to be fed.
in the past, I would never feed mine. My rbta just started loosing color and shrinking. His tentacles became almost nonexistent. I asked around and people said that it was the clowns that were hosting the rbta were killing it. I guess they just never really giving the rbta a break. I started spot feeding mysis with a small baster no flow and keeping the clowns away while he ate the food, 2 -5 min. He has got his colors and tentacles back.
For yours, It may take him a while to find his place in the tank.