Increasing numbers works to a degree w African Cichlids, particularly from Lake Malawi, but not CA fish.
The “experts” advising you clearly don’t know what they are talking about. Adding more fish is not the answer to dealing w aggression in Central American cichlids tanks.
These fish do not become less territorial in greater numbers. As
duanes
has mentioned many times on this forum, a lot of CA cichlids have huge solo territories.
How big is your tank anyway? Depending on tank size, you need to reduce your number of Texas to either a pair, or 1 male wet pet.