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I believe he said a green star polyps now that you said that, said that they will eventually encrust the whole rock once they grow bigger, which is why i picked it up.Hard to tell from the picture if this is a tiny Goniopora or a frag of Green Star Polyps.
They are Green Star Polyps and will glow under blues

I believe he said a green star polyps now that you said that, said that will eventually encrust the whole rock once they grow bigger, which is wy i picked it up.
It caught my eye instantly under the LFS display, I love it so far! Pretty surprised how quickly it opened up too, lets hope it thrives under my tankThey are Green Star Polyps and will glow under blues
Some people hate them, I personally love GSP however it seems to hate my tanks currently (It used to love my 4’ tank but it no longer will grow and just seems to slowly decline).
Also good to know, I just have a small zoa frag on the other side of the tank, other than that, these are my first frgas in the tankYes, definitely beware. While it is a very pretty coral, GSP (Green Star Polyps) will take over any rock they are placed on and do so quickly. They engage in chemical warfare with surrounding corals, killing their neighbors in order to compete for rock space. This coral is best placed on an "island" rock, completely isolated from the rest of the aquascape. In addition, once this coral does begin to encrust a rock, it will become nearly impossible to remove.

