Hey CCA family,can someone please give me an accurate pH range for my fish.They are mainly of the nandopsis,and Hericthys family.My water out of the tap is about 7.6
That's fine. Most CAs like fairly alkaline water (7.6 - 7.8) with a decent amount of hardness.
A little limestone rock in the tank (or crushed coral or some other source of carbonate hardness) can't hurt as well.
I've got no problem keeping and breeding all sorts of CAs (SAs as well) in our tap water. Lots of water changes out of the tap are better than fewer with lots of messing with the water.