ph levels

Can someone tell me what my ph lvl should be for a buttikoferi I'm seeing so many different levels online some sites say 7.8 to 8.6 and others are saying 6.5 to 7.0. So obviously I'm a bit confused how could they be talking about the same fish?

A few years ago I made some ceramic rocks for my cichlids out of a terra cotta clay (what they make pots out of) They have done well with my fish, the semi-porous surface allows for more bacteria to colonize it. I recently took a ceramics class and made some stoneware cichlid stones. They are...