have you noticed if it's happening to plants in specific mediums?

i think coco can run the pH gambit from 6.3-7 (not positive). coco does need calmag+ (or molasses). with regular hydro you want 5.3-5.8. are they all running from the same res?

did you presoak the hydroton? this could be causing your pH to run up.

how are you getting runoff?


-shake