I was looking for some friends for my c. leucomelas but hadn't had any luck. Was in my LFS and saw this group of 3 corys. It turned out that they'd been handed in to the LFS a few days before and no-one knew what they were, so I got them for £1 each

However, I can't work out what they are. They all have the same three rows of spots on their sides and the very dark mask and stripe on their dorsal fin and when seem from above, the stripe across their 'shoulders' glows.
I had a look and ruled out quite a few, but the problem is that my mind gets confused by all the spots and stripes.
Anyone got any ideas?
Thanks.