They definitely go exploring but almost never beyond the rim of the tank. A few months back (I either wrote about it in this journal or started a thread in the inverts forum, can't recall at the moment.... maybe both) I discovered that they love to leave this tank and go exploring during major barometric pressure shifts. Other than those moments, they've never gone quite this far.
Haha, yes, tickled to say the least.
Most of them end up as Crusty McCrustersons by the time they reach the bottom of the tank and go exploring on the stand. This is a first.