You do know you've overstocked that tank with fish?
A PB, 3 angels, and 6 other fish in a 55 is not good for long term care. I'd really recommend getting rid of the Blue Face and PB if you care about their longterm health. Both need a 125 to be healthy.
Back to your coral problem.
Bluefaces and bicolors are known eaters of lps,soft,zoanthids, and some sps corals, as well as clams.
SOOOOO
You need to do some reprioritizing of your tank and rethink what you are doing or you're going to waste alot of money. Please look into buying or looking through some fish and coral books to make sure what you put in your tank is going to compatible.