You really should have double the rock and sand for better filtration. I would get about 20 or so of nassarius, cerith, and a couple of astrea turbo snails. I like the nassarius snails the best myself.Also get some extra shells if you can for the crabs to use when they outgrow theirs,so they won't be killing to many of your new snails for there new home.
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Deb
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