Small pests hiding

hi i got a few frags from the LFS about a week ago. Ive been watching them making sure nothing was wrong with them or anything like that. So im looking at my orange zoa today and i see a little starfish looking thing (excuse my lack of a better description) crawling from under the rock the zoa is on i tried to catch him before he actually burrowing in the frag but i think he has made home inside my coral is this common? Is it bad for the coral ? any tips on how to get rid of these guys ?
thanks

Running
26 gallon bow front
2X korilla 1 heads
deltec MCe300 skimmer
aquaticlife T5HO hood lamps with luner bulbs

 

Asterina Anomal - Typically a harmless herbivore, members of the Asterina family are all but impossible to identify down to a species level. Since as with most marine families, there are members whose diets vary greatly, which can lead to confusion as to which species is reef safe or not.but most likely reef safe

 

does it look like a regular star , which would be the asterina. ive got alot of baby brittle stars , which are white with longer arms . they are totally harmless also

 

they look like regular stars just very small one was green the other was black. so most likely they are not damaging the coral?

 

watch them and make sure they dont seem to be eating ur coral they might get on ur coral but that doesnt mean they are eating them , just watch it but it should be fine

 

ok thanks he seems to be burrowed under the coral but maybe he is just hiding.