Flat Worm In Coral?

hello all, i just wanted to know if flat worms were known for going into corals, i was looking at my colt coral and i thought i saw a bubble in it...but it was moving in different directions and was the shape of a flat worm...is there anything i can do for my coral?

 

anyone? my colt has gotten very bit i have had it for a little over 1 year, it has spread to most of the rocks above it...well all the rocks there is a small ...reletive that is...still attached to the origonal rock, it looks a little "bad" (can think of a less drastic word...it doesnt look but but...it looks a bit off...) well i just wanted to know because that is where i think the flat worm entered, i see a small sort of ...cut in it..looks already healed but...can flat worms hurt corals?

 

looks here http://www.seahorse-nw.com/Predators.html

 

heres the thing...i know that most flatworms go on the outside of the coral but this one seems to be under the tissue...anyone?

 

bumb?