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I had a cheap TDS meter from ebay, but it gave up. I use strips to check ph

I am curious if the CMH raised the temp to acceptable levels or just produces IR in sufficient quantity

Based on all of the responses I am going to reduce nutrients by half again to feed 1/4 strength (of bottle recommendation). I will stabilize input ph to 6.0 and see what happens. Thanks again for the responses. I don't know how to tell what my plants need by looking at them. I don't have much of...

Thank you all for your responses. I am more inclined to agree with the too much nutes guess than the ph guess. I have been quite adamant about testing and adjusting the ph that it really can't be far enough out of wack to cause these issues. My cheap ebay TDS meter crapped out. So I am totally...

I use water from the well. it has an even 7.0 ph. i tested it a while back with a cheap meter and it had around 175 TDS

I have been struggling to figure out what is causing this ever since I started growing. It has occurred every grow. 5 so far. I make it through veg with nice happy healthy plants, switch to flower and within 2-3 weeks these spots start developing. Typically on lower fan leaves first until...