If it's the texas it will either start immediately or one night out of the blue. GT will either be mean initially or you should be Ok until it reaches maturity then it could turn nuts as well or might still be OK. I just don't trust texas cichlids with anything that can't beat them up. I've never had one that wasn't a bastard. They find the weakest fish and just won't leave it alone. I think your EBJD's will do best with you sevs. Try a midas or something equally as mean with you texas instead of the jacks.