Why do you think they are Rineloricaria hasemani? A stab in the dark?What name were they sold as?
Seeing fishes from Peru in recent shipments, I am making an educated guess that this could be Rineloricaria sp. "Peru" (http://www.planetcatfish.com/catelog...species_id=744).
Any better close up pictures (including one of the underside)?
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