I bought a green & pink zoo today and a yellow star polyp. At lights off tonight I noticed a couple of worm like characters on the star polyps. They almost look like possibly a snail out of it's shell. They both have white bodies with an orange strip on their back. Are these little guys good guys or bad guys? Sound familiar to anyone. Oh, I also hooked up a new filter system today and did some housecleaning and moved some rocks around. Maybe something that is in my sand? Thanks for your help! 8O