<a href=showthread.php?s=&postid=9469977#post9469977 target=_blank>Originally posted</a> by IslandCrow
Sounds like that turbo of yours was probably on his last leg when you bought him.
As for the other questions. Yes, you should flip your snails back over if they can't do it themselves. Astraeas can't flip themselves, and turbos have a really tough time. They basically drown if they remain upside down long enough, not to mention their easy prey for scavenging crabs (especially those deceptively benign looking blue leg hermits). As for snails heading for the overflow, its a judgement call. If they actually get into the return piping, they could plug up your overflow and potentially cause a flood. . .of course, if you set up your sump right, even this shouldn't cause a flood. If you decide to head them off at the pass, it'll probably be a futile effort, unless you're watching your tank 24/7. I have a HOB overflow, and I cut a piece of acrylic to put over the top of the portion inside my tank so it's impossible for snails to actually get inside the overflow.