I don't see why they don't just set loose some loaches in their plant tanks. Those guys will suck up and kill every last snail.
because even if the loaches eat the snails, they won't take care of every single egg they lay. i've had no problem with petsmart plants carrying them, but petco is an entirely different story.
So remember, when you're feeling very small and insecure,
How amazingly unlikely is your birth,
And pray that there's intelligent life somewhere up in space,
'Cause there's bugger-all down here on Earth.
Loki/Grendel/Gail/Beowulf/Camilla/River/Bathory/Arwen/Lafayette/Deb/Jack Skellington (soon)