I picked up a tuxedo urchin on Saturday to help out with my GHA problem. He's about 4" across so they should fit in a 10 gallon. If you get one it may require feeding eventually. Mine leaves a path free of GHA after he passes over. Moves pretty slowly and is going to be a while cleaning up my 24 gal but is doing a great job. As an added bonus I think it's one of the coolest critters in the tank. The urchin has done more cleaning in three days than the rest of my CUC has done in four months.HTH
He seems to be a consumer of coraline also.
Brad
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