Does anyone know what this is it came off my rock one day it was on the back glass the next at the front on a rock not sure what it is

Not sure what these are but they have been multiplying the last week or so. Anything I can get to eat them or do not need to worry? Hope this link works for the picture http://imgur.com/RlLMV78

So here it is just like the title. About 3 weeks past my first victim floated up. Yellow head Goby, almost appeared to be Tore in half. One week later my Atlantic Blue Tang. Found dead with a Quarter size hole in his side. Then my Orange Spine this is when the flag raised. I was actually...

I have a worm in my tank that came in with a piece of live rock with maidens hair on it. I am unable to get a picture because it is very thin, about the thickness of a strand of maidens hair. It curls up over and over on itself so I can't tell exactly how long it is but saw it tonight stretch...