Looks like mystery snails to me
You have mystery and nerite snails. The nerite snails are excellent algae eaters. The mystery snails are while young but as they get older eat less. Neither will help with nitrate....only water changes will lower those.
Anyway, I see 5 different nerite snails...the zig zag one pictured by itself is also a type of nerite and Mystery snails aka Briggs aka Diffusa.....
it sure is
LOL I wonder if it's your spell check that keeps calling Nerite Snails ...Nitrites
That's a lot of snails. Hope you have a big enough tank to keep them fed.