That combo worked for me also, but it was a larger (8") male salvini with a smaller (6") JD.
I have bred salvinis a few times and I can tell you that the females are HUGE b----es despite their size. The males are more powerful, but more laid back. My male was the peaceful ruler of the tank. Whenever fish were fighting he would step in, kick the aggressor's butt, and then go back into his den. After that everything would be cool. He was strong enough to beat up a larger red devil though, so proceed with caution.
I have bred salvinis a few times and I can tell you that the females are HUGE b----es despite their size. The males are more powerful, but more laid back. My male was the peaceful ruler of the tank. Whenever fish were fighting he would step in, kick the aggressor's butt, and then go back into his den. After that everything would be cool. He was strong enough to beat up a larger red devil though, so proceed with caution.