Reef safe algae eating fish for 40g?

why fish and not inverts. I don't think there is any fish that are grazers that would fit in that small of a tank.
 
Real Mexican Turbo will take care the Green Hair Algae...and some red hair too.
Kole Tang will do a little but not all.
 
too small for a kole really, and they dont really mow algea down, just nibble here and there. best off with a turbo or the like
 
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