Brown flower stuff?

[nikosteen]

Got/bought a rock with some leftover corals from an system that was closing for my tank. Overall a lot of life.

Had some what is the brown flower stuff(it's all over the rock and moving with flow)

And an id on the green coral?

 

[Mr. Mojo Rising]

Run to your tank and grab that rock out of there. To me it looks like a mix of clove polyps and hydroids, both are very bad.

 

[mww00ds]

The first pic is definingly some kind of clove polyps. Which do grow fast, and can be a "pest coral" like Kenya tress or Xenias. I guess it all depends on what your long term goal for your tank is. If your just wanting some fast growing corals, keep them.

The second looks to be some kind of green montipora. Another fast growing, plating lps coral. Another easy coral that will quickly out grow itself. But also one that easy to frag, by just braking off chucks.