HURRAY, FINALLY A POTENTIAL SOLUTION TO MY PROBLEM. I have been fighting this problem for over a year now and have had NO success. The only I could do to keep it in check is to run phosguard full time.
My recommendation to you is, if you like it, and you want to keep liking it, buy one or two of those snails now to keep it in check. If you don't, and it starts to spread like crazy like in my tank, you will regret it.