Well looks like a feather dusters. It could be two growing out of the one tube, but I’m not sure.
You can either place these worms in a couple of inches or fine coral sand, or between live rocks is generally acceptable. where you have it now in that photo should be fine.
I read many of these worms live for years in aquarium with no special feeding regimen. But if you think its starving offer it brine shrimp
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