Here's a story of a hard lessoned learned on why not to have MTS in your tanks. I think of all the snails I have this is one of the coolest looking snails. I had some in a 6 gallon cube and they didn't seem to breed much at all. So I decided to take some from some of my outside tanks & put them into my opae tanks. Tons of algae in my tanks that there was more than enough to go around for everyone. Within a month tons of babies all over the tanks. Took out all the adult snails. Tried to catch as many babies as I could. These would congregate at the top of the water surface. Keep in mind there's no sand in this tank. Just lava rock. Worst mistake ever.