Parasites i think?
 

i recently purchased a fire coral and im looking at it today in my tank and it has Fine white grains of sand on the branches.... but wait a minute those white specks of sand are moving around.... all of them..... like little insects. anyone know what i have? i doubt i will be able to take a picture that would show anything better then a coral stock and what apears to be sand. there are no limbs that i can see.

I have heard of coral eating nudibraches, i do have other acros, but the creatures are so small could they be the evil slugs?

any ideas would be great.

Richard