Snails?

Turbos, astreas, ceriths, nassarius, conchs, and stomatella. They all eat algae and eat all different kinds so a diversity is best IMO.
 
Turbo snails are really fast, efficient cleaners. Unfortunately, they can eat coralline algae, so I opt for Astrea snails instead. They are slower and you need more of them, but they do a good job.
 
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