I agree and don't agree at the same time haha. I'm curious to see your findings over time.
My point like I said above is to discus. No amount of home breeding makes them survive better in harder water. Same with GBRs. They survive for a while and then just die.
Experiments are fun though so please keep us posted!
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Ah, rams... I keep bolivians and I had one tank where a stone was leaching some kh increasing materials driving my ph up, and another tank without that problem.
Same water for both (RO mineralized with seachem equilibrium). Bad tank would have kh near 6, PH in the high 7's and my bolivian rams (and cories) kept slowly withering away while they were thriving in my other tank without that problem.
Finally solved the rock problem and now have slightly acidic water in both with kh near, or at 0 and everyone is happy.
So, I also agree and disagree as I've seen the "they adjust fine regardless of their natural ideal environment" fail over and over. Otos, neon tetras, etc... But there are so many chemicals that simply stating PH and KH as a definitive defense of a hypothesis is incredibly incomplete...
I'm trying to keep this hobby simple and trying to avoid having to do too much to differentiate the tanks I keep from each other. I'm preferring to add more permanent materials (rocks, driftwood) to the tank to regulate the important things to create the best water for the fish. While only mixing up the same brew of water for all the tanks (currently have 4 running, 1 cycling and two on standby for the next whim.)