Herbavorous fish fit for a 4' 75g display

[Court_Appointed_Hypeman]

I would love a fish with the herbaceous diet of a rabbit fish or tang. But I do not want to keep one in an undersized tank.

I have sea lettuce that popped up in my display, and I would like to keep it around for a fish that would like to eat it.

I understand that they may wipe it out, and that's fine, I just have been sticking to letting every algae other than dinos dissipate without my disruption of the environment.

What's some good fish for a 75g that likes to eat more complex algaeas?

 

[Court_Appointed_Hypeman]

I do have a lawnmower blenny, but he is more into films turf and tdo pellets.