Hello, I have a 125gallon. I recently moved and just got set back up. We now have well water. I am having trouble with the ph in my tank. It it at 8.2-8.4. It comes out of the tap at 7.4. I wasn't planning on putting any fish in the tank anytime soon but yesterday i was given a marble cat,redtail,and tiger shovelnose. I need to know what is the best way with well water to lower and maintain the ph? Thanks!