Awesome! The "GJ" is Gloria Jean's egg, so that one should be blue barred. If not, then it's not hers, but that must have been the last one she ever laid before her molt-hers were slightly different than the BRs' and she liked a different nest than they do. She quit laying entirely after that.
If I wasn't sure which BR laid one, I just marked it BR. I like to mark who lays what when I can so that if one particular girl's eggs aren't hatching or there is some issue, we'll know that.
Laura, I like to candle at least once to remove deceased embryos so there is no chance of explosion from a rotting egg. You just take your time, hold each firmly, etc. There's no rush to get them back in the bator because a broody gets off the nest for periods of time, as you know.