HCA: Hermit Crab Association

Hello! I just "rescued" a cute new Hermie from Petco (I know, I don't like to support them, but we don't have many other options where I live and I couldnt resist!).

I have 4 other PPs in my tank. My new guy, Crabcakes, is much smaller and has a really dark blue pincher unlike my other crabs.

Is he a different species? Or is it possible that his coloring is different because he is smaller?

http://i.imgur.com/NmeNGNu.jpg

I would appreciate any info! Thanks!

Purple Pincher! The smaller ones can be pastel orange, pink, beige tones, with red legs and a deep purple violet pincer.

A person from Petco told me that Petco no longer carries any species but PPs.