I know this isn't a reef question, but there seems to be some current and former freshwater people, so I thought maybe someone would know. We did not buy any snails, one must have come in on a plant we bought. Now we have a bunch of them. Is there something that will eat them or is there way to eliminate them? We have a huge pleco that does a great job with algae. We don't want these snails. Any ideas? Thanks.