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Agree with the light and nutrient comment. Algae is the base of the ecosystem in nature and ubiquitous in saltwater. Snails will scrap of the fine stuff on the live rock that you will not get at. Yep hermits will eat some snails but I would do both snail and crabs with several types of each. They all like things just a bit differently and they will give your tank a balanced scrub.
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