MTS are by far my favorite snail. They won't out compete other things in the tank. Great for plants. They can reproduce like crazy but it not like you'll see them(all you have to do is feed less). You can sometimes get them for free, what's not to like. The only problem with them is once their in you won't get them out without a fight. So make sure you really want them. I took down my 10 gallon about a month or two ago and it was heavily planted but I moved everything out except the grave and the snails that were in the gravel. They're still there. There is no filter, no heater, no food... They even will sit on the surface tension of the water which is kinda funny. I looked this morning and I could see a herd of babies on the glass. I love 'um but be careful.