Reef safe?

[dc4]

Does anyone have any info on this type of crab? I bought it at my lfs as my wife reallllllllllly liked it since it looked like a anime "cartoonish" crab and was purple. The lfs had it labeled as a red spotted round crab and also said it was reef safe however I can find no information anywhere on the net about these types of crabs. The one I bought was the "smallest" one out of the 3 there and it was about 2" across. The largest one at the lfs was about 3 1/2"-4" across and was still very "cute" according to my wife, lol. I just want to make sure that it doesnt go around hunting my other inverts and making snacks out of my corals...