My Tomato clown also picked on my Mandarin, he was just so defensive of his 1/2/ of the tank, so the tomato went back replaced by an Ocellaris.
I feed my Mandarin live black worms daily and live brine once a week or so when I get to m LFS to purchase them. I also have started buying pods from {edit link}.
and I have over 100 lbs of liverock in my tank, but Most of teh fish and the shrimp also pick off the live rock so it is necessary to replenish the pod supply and provide supplemental feeding if you truly want to treat these little guys right.