poyp's being eaten?????

[inspector]

Hi all,I got up this morning to find 3 out of my 5 colony yellow polyps had been eaten not a trace of them left on the rock?I have hermit crabs,snails,cleaner shrimp,peppermint shrimp,abalone,lawn mower blennie,rainsford goby,clown goby and two clon fish do any of these eat polyps.appreciate any advice thanks Paul