I had a Clibanarius ransoni in my 5 gallon pico, but lost it recently to injures that occured in a molting (poor guy picked a really rotten spot to molt and got himself stuck between rocks...). I've left the system sit for a while because I wanted to make sure the molting issue wasn't a sign of worse things to come, but so far everything has been fine. The only exception is a buildup of uneaten meaty foods due to the clown goby's sloppy eating habbits. I also recently had success breeding marine Neritina species in that tank, so I'm not sure I want to go with another hermit in case it creates problems with the young snails. The LFS has recently gotten in some peppermint and camel shrimp. Would either of these make a good substitute while still being safe with pinhead-size snails?