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using nerite snails to control brown algae

Just got 3 tiger nerite snails yesterday to reduce some of the brown algae or diatoms on my aquarium glass. I just finished closing up the top lid excluding my 2 power filter openings to keep my snails from sneaking out the tank. I'm impressed so far from the algae they have consumed. I did a research and nerite snails were the best snails for eating algae and they will not reproduce on fresh water. They are also cute and fun to watch, but poop a lot. Has anyone here have nerite snails, and how long have yours lived or living? I'm fascinated with lifespans of living creatures.