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It's been on my list actually. I thought maybe I could get by with using a feeding schedule and swapping things out but you're right it would be the only way to properly diagnose things. I'll have to find a way to pick a meter up faster.

My first thought was calcium, I'm using GH flora trio and adding some cal mag, but maybe it needs more? I might have gone a bit light with the cal mag. I don't have an EC meter unfortunately but I calibrate my PH meter almost weekly. Could it help if I upped the nutes and cal mag?

First time doing a DWC grow, and I've only grown in soil once before so I don't really know what I'm doing. I used some clones and put them in a setup with a tub a couple weeks ago. They have been growing quickly but I started getting spots on the leaves almost from the start. At first I thought...