Instead of breaking the rock, wash it with a pressure washer. They do an Amazing job. I just did one of my rocks that was far too overgrown with brown star polyps. Now its a nice clean rock waiting for some coralline growth.
Ask Christy about the success of pressure washing Algae of rocks 
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Gerald
Home:160Gal. Foxface, Yellow Tang, Blue Tang, Coral Beauty, Lawnmower Blenny, Starwberry Dottyback, Mandarin Goby, 2 Percula Clowns, Green Brittle Star, Brown Brittle Star, Chocolate Chip Star, Cleaner Shrimp
Store: 33Gal. Green Brittle Star, Chocolate Chip Star, Peppermint Shrimp
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