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Do you have any mushrooms? It looks to me like newly split small hairy mushroom. I have melon size rock that's completely covered in them and that's what they look like when a new one pops up. They're pretty nice (great movement) and they grow like weeds.
My 2nd guess would be majano. They're pests but can have colorful green or purple tips like that. It still looks like too many tentacles to be a majano though. A closer photo under white light could help clear it up a bit.
Will do tonight.Could be a mushroom or something else that hitchhiked in. After all, that's how an aiptasia would get in. SOMETHING sure got in.
Can you angle it up to the light a bit and take a picture in whiter light? That is 100% not an aiptasia.

