Quick ID question

[Brewbush]

Just got a few new coral plugs. Dipped them in coral rx. Noticed this guy at the bottom on the mushroom coral, I am not 100% certain what it is. Thanks for your help

Also as an aside I noticed my emerald crab climbing over and picking at my zoa and poking at the mushroom coral, I assume he is just cleaning them as opposed to damaging them?

 

[Spare time]

Looks like aiptasia? I would take that out of the tank, cover the aptasia with expoy or superglue, and then make sure it is covered before it goes back in.

 

[reefpunk707]

I can't see what critter your talking about but I don't think your crabs hurting anything. Just cleaning. My hermits will clean all the new coral I add.