I think you said you have only Jacks and a couple cats in there? I'll look forward to hearing more of how the babies do. I have a male and female Jack that I bought at the same time, but the male has grown SO much faster than the female, I'm not sure they're a good match anymore. What's more, I'm hoping they don't mate, because I've heard that the adults get very aggressive toward any other fish in the tank that they may see as threats to the babies. I've already lost several smaller fish to this male Jack, and had to move other fish out of "his" tank-- even tho' it's been "their" tank for much longer!