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Is this a calcium deficiency? Also, are the tips just turning purple? This leaf is on the top the plant, and only a few have these spots. I am in week 5 of flower, and things are going well, this is more just for future reference for myself. Thanks for your time!

I noticed these microscopic white bugs in the video when I was watering. I hadn't noticed them up to this point. I do not notice any leaf problems, and the girls all look healthy. So, I would like to identify this early, and eradicate if necessary. Any help is greatly appreciated. I have a...

I recently started using a ro2 system with a kdf-85 filter. My input water is around 7.1 and after filtration, it is coming out at 9.1. I have recalibrated my meters, and this is still happening. I ran around 20 gallons through the filter and tried again and it's the same. My PPM at 500 is...