Finally think I spotted one of these goes roaming a bit. They do NOT like light. Only about an 1/8" long. Can barely see him long enough to make out the shrimp shape.
Have spent probably 20 hours staring at all the life. Several of the crabs will now rush out of their hole in the rock to grab a small piece of shrimp or scallop from tongs and the monster will do some funny displays - looks like he's doing push-ups if he doesn't wanna be bothered. The large porcelain crab will take a piece of shrimp as well but the little hairy dudes will run up and steal it from him if they see it.
1/4" Urchin has been roaming this evening as well.
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