Although many have called these snails pests, I don't perceive them that way.
You don't see them much during the day, because they tend to bury themselves in the substrate until dark, rummaging around, which is somewhat helpful in keeping substrate from going anoxic, providing just enough oxygen within to hold much more beneficial bacteria than when anoxic.
I also find the eat nuisance algae, but allow more desirable algae to grow (I happen to like certain types of algae)
They also break down organic material that can be more easily used by beneficial bacteria (or plants if you have them), and are a normal part of the natural aquatic habitat.
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The only problem I have with them, is they can place themselves between impellers and the volute of pumps, and getting caught.