Changing water type in fish tank to lower Ph, okay or not?

Distilled water is pH 7, so it wouls be an easy way to bring your pH down. 7.6 is a bit high for the fish you have, but not bad enough to be a problem most of the time. If you find that your tap water is hard ( which high pH water generally is) you can continue to use the conditions, or do your changes with distilled water. Sounds like your tapwater would be perfect for Malawi cichlids!