As already stated, you don't have to adjust your pH. However, if you were interested in how you would lower the pH, you would most definitely need to lower your KH
, which is keeping your pH in the alkaline range. KH
measures the buffering capacity of the tank, which is the resistance to pH swings. The more buffering capacity the more acid can be added with no effect.
One of the best ways to get your KH
where it needs to be before you start messing with the pH is to mix purified water with your tap water. The purified water can be reverse osmosis (RO
), deionized, distilled, spring water with a low GH
, etc. I'd let the pH stay where it is if I were you. It's not going to hurt anything at all sitting at 7.8