Seriously unless you specs are way out dont bother trying too get them perfect a discus would be more happier in a ph of 7.6, kh 5, gh 5 if it was constant rather than a "ideal water condition".
Really we would all love specs of ph- 6.7, kh 4 gh 3-4 but it doesnt work like that, and there is no reason dumping chemicals in the water too achieve it..
i used some kind of buffer which created a ideal water, 6-6,4 and 3 gh and 3 kh and the parameters has been like this through 8 water changes, so why not?
Welcome to the forum Spagh1i. That sounds like good news. You said it kept parameters constant thru 8 water changes. Can you tell us how large were the water changes, and in what size of tank.
Did you add more product at each waterchange, or did it hold things constant with just the first dose.
Oh, and if you can tell us what town or city you are from, that would be good.
Thirty-five years keeping and breeding discus, and I'm still learning :P