Nice looking shrimp Abby,,What type is it?

Hiya I'm not 100% sure... the petshop called it a ninja shrimp but when looking on google, he looks a little different!

To be honest they werent very helpful, they are selling all their shrimp are 'algae shrimp' when some are clearly amano, cherrys or pure black!
This one was pure black in the shop with a white line but when I got him home his colours came out properly.