Very territorial fish. A small one may be ok in a 10 gal by itself for a while, but will out grow it. A scooter blenny would quickly starve in a 5 or 10 gal due to its food source of copepods would deplete quickly. A few small blue leg or red leg crabs and a few snails should work for a cuc. I'd go with a couple of astrea snails.
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