Please help..... Newbie!

[ff.rice]

Hello all.... I am new to saltwater and got some live rock in my tank recently. I have been noticing a lot of new creatures on it since I got it home. I was wondering if you all could give me some feedback on what these creatures are?!?! The first is what looks like little brown trees and it gets larger with the lights on..... The second I think has been identified in several threads as bristle worms..... And the third looks like grey ferns..... Are these good?!?! Or bad?!?! And if bad, what do I need to do?

 

[Hondatek]

Fourth pic is a brittle starfish leg which are fine. The orange are bristleworms also fine . The brown things are Aipistasia and need to be killed before they spread and take over .

 

[ff.rice]

Fourth pic is a brittle starfish leg which are fine. The orange are bristleworms also fine . The brown things are Aipistasia and need to be killed before they spread and take over .

Awesome thanks! How might I go about killing the Aiptasia?!?! I'm ready to put fish in but I think I need to take care of this first!!! Is there a fish or anything that eats them? Can I take the rock out and cut them off?!?!

 

[Hondatek]

I use aipistasia x. Bought it from the lfs you just inject it in the mouth and cover them up with it . Trying to cut them off will cause them to spread faster. There are fish that will eat them but aipistasia x is the way to go .