id please on corys in sig

If I didn't know any better, I'd say they look like Corydoras melanistius, or Black Sail Cories. They do resemble the C. leucomelas the SirMinion pointed out as well, but blackfins look like it's mainly the dorsal fin that's black, whereas for black sails the black coloration extends in a stripe down the fin and also down the body.
 

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