Algae-eating "sharks"

I suspect that the Otos are more to "blame" for the reduction in algae 
but yes, Labeos (actually, it's now in a different genus but I can't 
remember which one offhand) are herbivorous.  Both my L. bicolor and 
frenatus are steady consumers of algae.


> I recently added a black shark to my plant tank, as I have heard that they will
> eat algae.  Can anyone else confirm this.  The hair and beard algae have been
> severely trimmed back since I added the shark and 6 otos.  I have not noticed
> any plant damage that I can attribute to the fish.