I'm using Pro-mix. Checked the pH and I'm running a bit high. Checked using green drops. Just bought a rapitest ph meter to test soil and runoff (though I don't get much runoff in these 5gal pots, even w close to 2 gallons water). I think I'm somewhere around 7, 7.5. That's high, I realize. So I got some pH down, and against the plants best interest added some slightly acidic water for two days. This has had a negative effect on the plants, some leaf browning and unhealthiness. I think you guys correctly diagnosed, I just went overboard in trying to fix it. Will now start watering at 6-6.5ish consistently.