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I second that...check your ph! too low, and calcium will be left on the dinner plate. spots that turn to rust in between the veins usually points me to the mag/cal bottle if my ph is good.

I have similar rust spots on lower leaves like that, and when I tested the ph the old fashioned way, realized the ph was at 4-4.5. Digital was WAY off. If your ph is at the proper level, and HAS been, then you may have a fungal issue, and want to lower the humidity to around 50%, and spray the...

don't be an idiot like myself, and calibrate your ph tester if its necessary. I have similar rust spots on lower leaves like that, and when I tested the ph the old fashioned way, realized the ph was at 4-4.5. Digital was WAY off. If your ph is at the proper level, and HAS been, then you may have...

don't be an idiot like myself, and calibrate your ph tester if its necessary. I have similar rust spots on lower leaves like that, and when I tested the ph the old fashioned way, realized the ph was at 4-4.5. Digital was WAY off. If your ph is at the proper level, and HAS been, then you may...