What is growing in my tank? Pics added

[Mandosh]

Originally Posted by tim the toolman

I do not think they are colonial hydroids as I have never seen a head come out of them. They only slime occasionally which according to what I have been reading is how Vermetids breed.

Nah, they look like vermetids to me as well. Just wanted to point out that they are, by far, not the worst case scenario.