Thank you all for the replies! Looking at pictures, Brachyrhamdia marthae seems to be the closest match.

Hi,

This little one came in as a hitchhiker in a shipment of freshwater fish for an independent aquarium store. Can anyone help me ID it? Thanks in advance.

Sorry for the poor photo quality. It's the best I could do. The fish is overall a dull pale grey with long barbels and a single black lateral ...