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Yes they are translucent no reaction to movement or light either, theres a couple of them, they look like they go into the rock, also id on the other one thats circled please, thank you
orange/brown is some kinda paly they could be vermited snails, their tubes appear clear when they first move, can you break them off? are they hard and pokey or soft. you will be able to tell if sponge right away.