At very low tides on rocky beaches I sometimes see a pinkish crusty… something… on the rocks. Maybe some kind of hydrocoral? I’m not great on species that generally require a wetsuit and scuba gear to examine closely.
Anyway, this rock caught a bit of sunlight and glowed pinkly under the weed in a tide pool. The sun went behind a cloud the instant I uncapped my camera, of course, but a bit of the pink glow was still there.