Need help with ID. Freaky thing!

Kodiak5500

New member
This long green "arm" was coming out of my LR and was inside one of my corals.

ill give you some background really fast. I usually turn off my lights when i go to sleep and leave the leds on, or nothing. Before i do that i turn off the two white bulbs and leave on the two blues for about an hour. this time i crashed before i could turn off the blues.

I woke up and just turned on my whites and was looking at the tank. i saw this long thin green thing coming out of my lr and inside my anthiea. It wasnt moving and it didnt look like a worm. it was even suspended off the LR at one place, like over a gap. I was like ***! so i touched the coral to see the reaction and it went RIGHT back into the LR. like super fast.

Any idea what this is?
 
it seemed to be a lot thiner than one of those.

for the length to thickness ratio it also seemed to not be an arm of a bristle star.
 
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