EBJD are a genetic morph of the regular JD. The electric blue gene is recessive, and if you breed an EBJD with a regular JD, all of the resulting fry would be carry the blue gene, but none would show it from a phenotypical standpoint. EBJD grow very slow compared to Jags, so I wouldn't think they would work too well in a tank together. Many people also believe that EBJDs are less aggressive than normal JDs, although I haven't found that to be the case IME.