Keep your ammonia level at 0, your nitrite at 0, your nitrates below 20-30, and your KH above 80 ppm. Ph depends very much on the fish you are keeping. For a lower pH in aquariums where the tap water used is very high (usually 7. 8 or above), I have used blends of RO (Reverse Osmosis) water and tap water. The ratio varies with the tap water pH, KH, & GH and the water conditions I want to achieve. With Discus it can be as high as 75% RO. Then to maintain these conditions I use peat in my filters. Note that GH does not affect pH, and magnesium (a major ingredient of GH) is important to fish metabolism. Also note that calcium which is the main factor in KH (which does affect pH!) is also important for fish metabolism and fish health and healing. With the above method of using RO (or DI) water in a blend with tap water and peat, I have still been able to maintain a KH above 80 ppm (for proper calcium absorption), sometimes with additives such Wonder Shells or Calcium Polygluconate. This is only very general information, there is much more in depth articles about each of these subjects and more available. But these are sound principles to follow, based on 27+ years of aquarium maintenance experience. As new and better methods become available, I regularly update my information to reflect this.
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