I always liked emerald crabs in a small tank like yours I’d only put one .
Reefers say never trust a crab .
They are opportunist so if they run out of algae the might try something else .
All the years of having emerald crabs I have never got a gouge one .
Now hermits yea bad killed my snails just because they wanted to try a new shell then went back to there old shell . Go figure
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