I have 25 turban snails in a 420 and some have died off due to no algae being available. 10 turbo snails do a lot of work they are large and work all night eating algae. Also a tomini or bristletooth tang can be added if they aren't keeping up but I doubt that would be that case. Turbo snails are larger than any of those snails and almost exclusively feed on algae.For a 160 gallon 10 snails is a fraction of what you will want.
I have a 25 gallon, 20 gallons of actual display area and I have 5 super nassarius, a half dozen or so trochus, astrea, and nerite and now hundreds (literally) of stomatella. They all have plenty to eat and algae still grows on the glass.
I also have two hermits.
Just don’t add them right at the beginning. Add them after you have some algae growth and in stages.