"Texas" as well as most Centrals have different personalities. I've had Carpintis in community tanks very middle of the road and Cyanoguttatus which I'm breeding now that are wimps. Escondodo Carpintis has always been a serial killer at 3" or so in my fishroom. At 2.99 a pop, buy a few and let them pair off. They will most likely be interested in their own kind and leave the jag alone, which the jag probably prefers, and the numbers of fish will not let the jag home in on any individual. Extras can always be given back to the LFS and you are only out $2.99 ea. Your missing the dramatic breeding coloration of a Texas Cichlid which if you lucky can occur at 3-4".