If you are keeping Discus, one of the most sensitive fish on the planet to nitrate and ammonia, and water quality as a whole, I don't think you want to mess around with any kind of soil for the first time. You want things to be as stable as possible.
Any type of clay gravel would be inert. Flourite and Eco complete do not alter the pH. Turface is a little alkaline. If price doesn't matter, I prefer Eco complete to Flourite for several reasons
Robert Paul Hudson
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Kindness like love is unconditional