Sean
Thanks for the tip, I might give that a shot. I'd like not to have to run the drain back to the sump.
Are your snails out during the day? Mine only come out after the lights go out. I love the little buggers, free cleaners that at too small to knock over anything (unlike the HUGE hermit my wife won't let me exile to the sump...if he gets any bigger I'm gonna bust out the butter). At least one of the snails looks like it has the clasic bands, but maybe not.