I have quite a bit of coral and fish along with a bit of different shrimps (fire, skunk, peppermint and pistol) i am very picky about what goes in and what stays in as everybody and everything gets along quite well. I have a 210 gal so there is definitely room for him ONLY if he is safe for all that is already in there. Is black rare? Everything I seem to look up for slugs nothing is black except a stomatella but it doesn't have a shell that I see. He can lay almost flat and is fast compared to the snails and crabs I have lol.
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