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They come in different colors. Brown and green are common.A few people have suggested hydroids in other threads, but these are a dark green and the stem/tube is thicker than any pics of hydroids that I've seen. I think I've seen them eat some of the small eggs/polyps that I feed to my clowns and corals. One of my Nassarius got a little close with it's ?antenna/snout? and retracted it pretty quickly, so I'm pretty sure they sting. They are mostly contained on one small end of a rock that I have some GSP isolated on (rock sits in the substrate), so it'd probably be easy enough to pull the rock and chisel off that piece of it. Just trying to be more certain about what they are in case they start popping up elsewhere.
Be careful if you're sensitive to nematocysts... I got a nice sting/rash handling a rock with these on it.Everything I had seen about hydroids made them look almost like dandelion seeds. Did a bit more digging and I found a few better pics. Thanks all.
Hydroids it is... Darn.
Guess I'll be pulling the rock and lopping off the end
Thanks for the heads-up!Be careful if you're sensitive to nematocysts... I got a nice sting/rash handling a rock with these on it.