Are snails sleeping or something else?

I've had 7 orange rock snails in my aquarium for a few weeks now and when I checked on them today, a few of them had their antennae (or something) pointing downwards and were hanging almost motionless on the wall. Is that normal?

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PatchrinT
1 year ago

Maybe it's too cold for them and they're letting their antennae droop. Not antennae, then. 🙂