Had-A-Snail is a high copper solution (copper sulfate pentahydrate actually) that kills snails and other invertebrates. It can be hard on sensitive fish as well like plecos, loaches, and freshwater "sharks." Here's the PAN page on it:
http://www.pesticideinfo.org/Detail_Produc...&DIST_NR=008999My page on snails and ways to control them is at
http://www.fishpondinfo.com/snail.htmTommy, if you don't want to tear down the tank, then you might try baiting the snails. You could toss in something they like to eat. For some snails, that could be romaine lettuce. For others, it might be more meat-like, for example a piece of lunch meat (I know, it could foul the water). Plus, your fish may go for the baits instead. Put the bait in after the lights are out. A few hours later or in the middle of the night or early morning, pull or pick the bait out to remove the congregated snail party.
Check out this person's idea:
http://aquaweb.pair.com/forums/archives/lo....cgi?read=88242