Snails and crabs clean algae just fine, at least mine seem to. The only thing they don't eat is a small patch of cyano in the back of my tank. I use a mix of nerite, cerith, astrea and nassarius snails and scarlet, blue leg and left handed hermits, plaus an emerald crab to keep my tank clean. The hermits are in very small numbers, a couple of each, just because I like to watch them.
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