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Never seen anything like it. Try to save it till you find out.
I was just going to suggest it might be a ribbon worm after looking at some images. I'm not sure which specific one, as there are apparently close to 1800 varieties...Quite possibly a variety of ribbon worm. They come in a variety of colors and patterns. They are predators of other smaller organisms.
Pretty are they reef safe.Here's an example of a similar ribbon worm. You said that it moves like a snake. Ribbon worms are known for this because they lack the "appendages" clearly visible in Hesionidae, which are similar to common bristleworms in this regard. Ribbon worms are smooth bodied.
I looked back at the picks the one from the tank looks like circles not ribbonsPretty are they reef safe.