I feel like I am becoming the pH police here
why do you feel you need to increase the pH?? unless you have wild caught fish that have always been in high pH water, your fish are going to be more than happy in 7.5 water. they will be healthy and breed. unless there is a specific reason why the pH must be higher, I would recommend to just keep it as is. it will be a lot less work and one less thing to worry/think about.
the fish don't know how to read the pH tests, so don't worry about it
especially for Africans. I have kept them in water from pH of around 6.8 to 8.3 and have never noticed any differences in their appetite, breeding, etc.