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CUC stands for Clean-up Crew. Normally your snails, hermits, serpent stars, etc. The ones that help cleanup algae and detrius (fish crap, but a nicer way to put it)
Ahh ok now I see. Ok well in that case no tellin. I got that smooth serpeant starfish. About 4-5 snails and a scarlet leg hermit crab that's not very big at all.