pond/bladder--never can remember the difference between the two and everyone pretty much just calls 'em pond snails anyways.
Excellent test pilot for the new bowl--I generally scoop a couple of these for any of my planted vases. If they dont' crawl out after three days, you're generally good to add shrimp.
I have this exact bowl by the way--currently holding some backup riccia, shreds of a moss-ball, one huuuuge MTS, and three juvie cherry shrimp with a 1/4" of sand as substrate. MTS has been there for two months, the juvie shrimp for one month--neither growing particularly fast, but they're living on biofilm alone so it's not surprising.
