Unexpected plants

Nate0712

Reefing newb
I have had my aquarium for a little over 2 months and I noticed these small circular plants that grow on my live rock when I tried to touch it, it closed up and appeared to be sucked into the rock.. anyone know what Im talking about
 
Google "Aiptasia" and look at the images. Is that what you've got? If not we'll need a little more detailed description (or a photo) of what you have in order to ID.
 
They probably hitchiked in on your live rock. The can spread very rapidly so you want to be sure to deal with it right away. The best stuff is to use is Aiptasia-X, and then get a peppermint shrimp to keep them from coming back.
 
It's a pest anemone. They spread very quickly, and will take over your rocks. The can potentially kill other (good) things in your tank, so you need to eradicate them as quickly as possible.
 
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