I think Ricker is referring to my suggestion to someone else a few weeks ago - the 'Penny Trick'. I'm not sure where I got it but I've definitely had good luck with it, however I think it works better for prevention than cure/killing of snails.
Trick is to find 10 or so pre-1983 pennies and place them under your gravel. If you have a non-canister filter, you can even put them in your filter so that all the tank's water is constantly passing over them. The extremely small amounts of copper that leech out may be of help to you and with any luck, your tank will be filled with empty shells soon!
Why is your pH so low? Rid-a-Snail works great if you're able to get your pH around 7ish, especially in conjuction with the penny trick.
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46G Bowfront: 1 large snakeskin gourami, 1 blue gourami, 2 pearl gouramis, 3 yellow honey gouramis, 12 black neon tetras, 1 albino pleco. All gourami's are female as far as I know.
Lighting: 78 Watts (1.7 wpg) T5HO
Plants: Java Moss, Flame Moss, Marsilea Minutia, Marsilea Quadrifolia, Staurogyne sp., floating Myrio Simulan.
Substrate: 80 lbs Eco-Complete.
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