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Unfortunately, I use Amazonia Aquasoil, not Amazonia II like you have. The original Amazonia is a lot more potent than the Amazonia II. But still you should see it last 3 years if you use RO water and keep KH zero to low.

LOL that was a joke. You didn't have to explain it, I completely agree with you. ? Raising pH with plant substrate is always ONLY for the cycling stage. Once a tank is cycled, reduce pH, as that helps with longevity of the plant substrate. The short period where pH is raised during cycling doesn't impact it's longevity by much. But it helps ease the whole cycling process for people new to the hobby. A lot of people cannot understand why ADA needs to cycle so much longer. And when one is new to the hobby, they give up earlier and start rushing with adding in livestock, only to see them die. I have an ADA substrate tank here that is still going after 6 years without changing the substrate.