I'd agree, the damsels can be very mean little buggers and the mandarin is a very peaceful, mellow fish. Also very slow moving.
You would have to have ALOT of live rock and a very mature tank to even begin to have enough pods
I bought an ORA special mandarin that supposedly ate only pellets. Got him home and he wouldnt eat. he wiped out every pod in my tank and I had a fuge and a decently mature tank. i managed to get him eating frozen food, though I had to buy like a dozen different kinds and try sometimes 10 times a day to feed him any thing and everything. It took a month of non stop feeding for him to begin to eat frozen. her could have easily died, if it had taken even a few weeks longer he wouldnt have made it. :-(
I had mine for abotu 2 and a half years and he just died a few weeks ago due to a tank move, it stressed him that much.
These fish are probably one of the hardest fish you could hope to keep and the vast majority die of starvation.
Here is a shot of my Mandy, gone but not forgotten......