lol, "Bug Tank", that's funny :lol

Check your Ammonia, Nitrite, and Nitrate levels before you add snails or hermits - high levels can wipe these guys out quickly!

Amm & Nitrate should be undetectable, or near 0, Nitrate is not as toxic as the other two, it is not unusual for Nitrate to be 10-20 in a new tank depending on frequency & amount of water changes.

Keep an eye out for your new friend, it could be a bad guy, like a Mantis shrimp? Probably nothing, but if it moves fast and looks mean ... it probably is?