Corals disappearing?

[helbel]

Hi everyone
Just curious about a few corals ive had go mysteriously missing..
2x Xenia and
3x Green Morphs
each coral has disappeared overnight, with a little bit left over on the rock. im used to seeing corals move about especially the xenia - but thats usually slowly. particularly with my xenia's it almost appears they were cut away from the rock by something and i dont have a huge amount of live rock so i can pretty much see all the nooks and crannies in the back of tank and theres just no sign of these corals?! the xenias were about 10cm tall each so it nags at me where theyve gone! could something be eating them?
My tank consists of:
1x Sailfin Tang
1x Six Line Wrasse
1x Arc Eye Hawk
1x Ocellaris Clown
and a feather starfish.
I do have regular clicking in my tanks and i have previously dipped all of my live rock in fresh water for a few mins each piece and to no disappearance of the clicking of some sort of shrimp! (probably was a bit risky but luckily my rock is a-okay) not sure if this shrimp is of any connection :/
any suggestions would be of great help!

 

[lord fu fu]

it sounds like you may have a mantis shrimp, im not sure what they do to corals though

 

[novahobbies]

Large bristle worms will also do this, and you'd be amazed the miniscule holes they can squeeze into. You might want to keep a late-night vigil with a red light to see if you can find what's crawling around after hours in your tank. I once broke apart a piece of LR to discover an 18" worm that was basically in the middle of the rock....he'd tunneled into the rock so deep he had created a fault that made it easy to break.

 

[loopy101]

since you dont have a large amount of live rock i would do some research on a hypersalinity bath for the live rock.usually the good and bad critters in and on the rock will come out looking for better water. then you can pick and choose what critters to keep in your tank. but please do the research on it before attempting!

 

[novahobbies]

+1. Hypersalinity, so I've heard, will not do such a number on your bacteria population as hyposalinity sometimes does.