Would a JD, GT, salvini and texas cichlid be all right together? They would be in a 75 gallon tank.
because they are all aggressive and need their own tank space a 4 ft tank does not have enough space for all of them to claim... you will eventually have a 8-10" jd, a 10-12" gt, a 10-12" texas and a 7-9" salvini... sure it can work for a while but when they get to the 6" range you will have starting problems with fighting... on top of that you will need a lot of filtration and you will need to do a lot of water changes...I would just go with a pair of any of the four you listed and build around them or keep them by themselvesWhy would I need a bigger tank for that?