What is this? It's green, otherwise I would think Aptasia

[Cook]

I got some new frags today and when I was placing them in the tank, I noticed this thing. haven't seen this before, but it's in the back behind the main rocks so that doesn't mean anything. Should I be concerned or harmless? It's green in the center and seems to have been there for a while. I found a post from 2013 claiming it to be Epiactis prolifera or brooding anemone.

 

[Primereddime]

I've got some palys that look like that think they were sold to me as green deaths

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[bhodges82]

Green button paly

 

[york1]

Ya just a harmless paly. Just be aware they can grow fast and become invasive.

 

[sharis100]

Green paly- does contain toxins, so use care when touching or removing.

 

[Cook]

OK thanks. Not sure where it came from.

 

[jcook54]

Those things are survivors. I have some similar palys that I've been kalk pasting for years when they start to get too big for their britches.