Put some peat pellets in a mesh bag and put the bag in the filter or the tank.
Back in the day when I kept Discus, I used peat just as joe jaskot has posted as I'm not a fan of using the PH Up or Down products (or chemicals of any type). With my goldies, the PH is typically pretty stable, but the water where I live has a low PH & KH right from the tap, so I use baking soda to keep the PH where it needs to be.
I actually already mentioned that I have added peat to my tank already.
It's in one of my canisters. Baking soda? Does that work with fish? What does it keep the water at?
Product info: "SeaChem Neutral Regulator™ adjusts pH to neutral (pH 7.0) from either a low or high pH and maintains it there. It softens water by precipitating calcium and magnesium while removing any chlorine, chloramine, or ammonia. The use of Neutral Regulator™ makes other conditioning unnecessary."
I have not used this, but heard people mention it. when used regularly and with all water changes, it is supposed to just maintain a level ph, without swings.
The "ph Up" and "ph Down" products are not a healthy approach. Neutral ph, being non drastic is safer because it is self limiting.
but may not be best for spawning really soft water species, especially wild caught.
ph changes should be gradual.
This seems very promising. Sounds like the perfect solution. So there are really good reviews on it?