Specific algae eaters for Diatom algae?

Does anyone know if there is a specific algae eater that is noted for 
actively preferring diatom algae as part of it's staple diet? I'm 
correcting some water imbalances in one of my tanks that have kept me 
plagued with diatom algae for a long time, but I was thinking of adding 
an algae eater to this tank anyway, so I figure I might as well seek out 
one that will find the smaller remainig amounts of this stuff appetizing.
Douglas Duncan
email: duncand at sprynet_com
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