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GH/KH aren't an issue... pH isn't really either. Just wondered how adaptive they were to storing whats needed without co2 injection.
My GH is around 5 and KH 2 right of the tap. pH isn't too bad for the most part but that can be changed thru various methods and I don't mean by destroying the water with acids. Like a mix of RO and tap could bring the pH down. I don't think it would take too large of a mixture. My water is fairly neutral around 7 - 7.2 With CO2 it usually drops to around 6 - 6.2 for reasonable concentrations. Thanks for the info though.
I have experience with it in a somewhat inert substrate. It grew well for a few months in sand, 30gl, 3wpg PC, 2x DYI co2, dry fert dosing similar to EI, and jungle root tabs. I eventually killed it during a period is collectoritus and stumbling upon the secret for growing stems, everything including belem shot into overdrive and I failed to compensate with extra dosing, nitrate dropped to zero and the belem went downhill.
I'm pretty sure it needs plenty of CO2 and is a poor competitor.
I had a massive stand of it in my 180 for a couple of years, good for CO2 testing since it's very responsive if CO2 is good, and does poorly if not.