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I never had one before, and it just kind of freaked me out. It came out like an octopus arm out of nowhere and this guy‘s been quite active for 20 minutes now. But a trochus snail and a peppermint shrimp went by it and it hid so not sure how predatory it is.It's likely just a common species of bristleworm, which are polychaetes just like fireworms. The venom of a fireworm is extremely painful though, and the venom of a bristleworm is annoying at its worst. I probably get stung a few times a month. It's less-itchy than a mosquito bite, and the worst ones I've had were far less painful than a bee sting.
Not fun to grab with your bare hand, but it's nothing harmful. These used to be considered bad guys, but now some people consider them part of their cleanup crew. To each their own.
Arrow crabs will eat them.