There is a split on CuC some people like me love crabs and snails others will go on a rampage killing as soon as they find them I have 9 blue legged hermits and 3 red legged hermits along with about a dozen snails and as far as I am concerned bring colour and idiosyncryes to the tank.
That is not to say all CuC is safe some of both species can be very destructive to your coral/fish/inverts again it is a personal choice J&L have excellent packages and can help you with choices. On the other hand you can run without snails and crabs and still have an awesome tank again its a personal choice
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 My aquarium is nothing but a smorgasbord for my cats.....
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