Just found this in my tank today, and wanted to know if anyone knew what it was, and if it is harmful. I hate to admit it, but it is pretty cool. it's a clear tube like thing attached to the underside of one of my live rocks, and it stretches out pretty far (probably a good 1-1.5 inches) and seems to just be eating algae off the rock below it.
Let me know if this is cause for concern or if it would be ok to leave it in there.
Picture:
Thanks for your help!
Rob