Nah, I have hermits, but not snails (I also have a fingerprint toby in with the puffer. Tobies are snail eating machines. It could be that snails aren't okay with the puffer, but the porker never had a chance because the toby was on them like white on rice. Although I really did have them in there for quite a while, I'd decided that I needed something to clean up on that tank, it's kind of skanky looking. There were snails in there for about a month and I never saw the puffer go after them.)
I was suggesting those two types of crabs because if you put a porker puffer in your tank, you will have clean up problems. That's just the way it is. I have a protein skimmer an Emperor 400 and 280, a DSB and LR...and while I never have problems with the water conditions (I kept a coral beauty in with the puffer for months until it started picking on the porker for some reason) the rock always looks disgusting.