Small herbivores for nanos?

[auto_loader]

Does anyone have a suggestion for any good herbivore fish that are suitable for a nano reef? I would like to have one to keep my macro under control.

[pulpsmack]

My yellow-bellied blue damsel makes short work of them. Blennies are reeef safe, but not suitable for nanos.

[clowdy]

if you aren't dead set on a fish then i would suggest a sally lightfoot crab. they can eat like you would not believe!