hello! i was given a few (trumpet) snails by a pet store who wanted to get rid of them last year... i quickly found out why. they took over my 30 gallon so quickly!!! when i upgraded to my 60 gallon i very carefully inspected and scrubbed each rock to remove all the snail clutches... thank GOD a year later, i have gotten my tank down to only having a few snails, which oddly enough call my filter home...

good luck!!!