I know this will be hard to say without a picture, ut everytime I get close with a camera it disappears. So with as good a description as I can give can someone help determine what I have and if I need to rid my tank of it. I purchased a LR today from the LFS I did not see this critter on the rock before I bought it. It is about 1 1/2" long (could be longer never saw it come completely out of it hiding place in the LR. Is pink in color on the part I would consider the head and turns purple towards the rear. It appears to be Prickly ( or fuzzy might be a better description) and the prickles are white. Can someone help?