In all seriousness, agree with the GHA and I see some micro brittle arms! Feather duster the bottom of the frame. Does anything come out of the tubes/do they open like a feather duster or zoa? It looks too big to be vermetid to me, but I wouldn't rule it 100% out based on my opinion.
Thanks all. I do think the green is GHA, and there is many brittle stars there. I am asking about the tubes. I haven't seen anything like opening up like the dusters, I have noticed they "flinch" when fish swim close to them