aph

I have a PH and dKH problem. I just tested my water and I have a PH of about 7.6 the lowest I have ever seen it. And dKH of about 15. Can anyone give me some ideas on how to raise my PH and lower my dKH. Water Parameters: PH - 7.6 dKH - 15* Ammonia - 0 Nitrite - 0 Nitrate - 0/5 Calcium - 420...