I'd be careful with that for two reasons. First, they're not going to be able to clean the back of your tank (the glass) so you might end up with a wall of algae. If you can get to the back of your tank and scrap algae off the back from time to time, I guess it's not as much of a concern. They're also not as thorough when cleaning algae. Second, and this is just personal preference, I never trust a crab. I haven't had much problems with hermits besides them killing snails, but I've certainly had them with emerald crabs. Crabs in general are opportunistic so they may turn on you at any point. You don't really have this same risk with snails.Originally Posted by Reef Swimmer
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