Cory id HELP!

[23jim]

I bought these three cory's that were supposedly Julii's at Petco yesterday in a rush. Now I don't think any are. I like the two bigger ones, but not the small one. Can someone tell me what they are so I can buy another 3-4?

Is is possible the smaller one has just not developed his markings yet?

I plan on taking the smaller one back, and hope they get the same ones that the larger two are when they get their next shipment in.

I know I should have looked closer when I bought them but I was in a big rush and had looked at the tank a week before.

 

[jetajockey]

The one in the left pic looks like a peppered cory (corydoras paleatus)

 

[aqua_chem]

Other two look like corydoras blochis, "spotfin cories".

 

[23jim]

I want a large school of these, if Petco won't get more, will it matter if I get as similar as possible and hope they don't know the difference. The peppered cory was definitely the odd man out of this group. I like the look of them, but from all the pictures I have looked at I am still not sure of the species. Any ideas where to get more (mail order, etc.)

 

[23jim]

Got 3 more at another Petco. I think blackfined cory they might be?