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Isopod-Serolid? (Sand Skater). Does it have a hard shell or is it soft bodied?
Check out the picture and compare:
Hitchhikers Guide - Lionfish Lair
It’s soft.
Its definitely not a flatworm and to the OP no need for an alarm. Chitons don't neccesarily feel very hard to the touch that size. Even if it is a sand skater it is harmless. I'd leave it be as it's a good member of the clean up crew.