Hi just bought 2 anemones from a local vendor. They were inside a pot. Wanted to remove them in the pot and found these. Looks like a bristle work but don’t know what kind. I did research and it says bristle worms are beneficial to reef aquariums but these look like fire worms isn’t it?? And as far as I know fire worms aren’t good. My first time having these kind of pests in my aquarium so giving me knowledge would help. And also saw something swimming not sure if these are brine shrimps or another hitchhikers. Would appreciate all the help.