Yep that's Gonodactylus Chiragra, not a peacock (O. scyllarus)
http://www.ucmp.berkeley.edu/arthrop...ame=g_chiragra
#1 life lesson to mantis shrimp, LFS and online suppliers who get their IDs correct are one in a million.. seriously it's sad how many LFS label the wrong species of stomatopod as peacocks.. even if it's extremely obvious that it's not one.
Anyway, that burrow is definitly not suitable, you can clearly see the stomatopod in it, which is a bad thing. This means the burrow isn't dark enough for the animal. It is very exposed and the burrow doesn't have a narrow passage for it to cling too and rotate with ease. Again, I would seriously consider PVC.