my EBJD experience is a bit different (I only have the one): I got mine at 1", for $30 at a local LFS that never has them, but somebody special ordered 6 EBJDs, and they had a delivery of 8; since I shop there a lot, they let me pick one out before the guy picked 'em up . . . cool
I've had no problem keeping mine alive; I've kept him in tanks w/ and w/o UV lighting, but good water conditions always. he's now about 3" and seems very healthy . . .
my only reservation is that despite his bright blue color, he is actually a pretty ugly little fish (!) because, unfortunately, he developed that "beak" look that is common to this breed. I'm hoping maybe he'll grow out of this particular stage . . . still a great little fish, very active
yours are really beauts by the way; good luck!