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@Hattiwatti, Well in my case. In DWC with RO water, it will. I stupidly put my ppms at 400 and it almost killed all my plants. It took them two weeks to recover. I will never do that again. Less is more. The critical strain ended up hermieing on a branch in the back and spread seeds in my tent. Mostly to itself. But I have found a few fat ripe seeds in my other strains. I also had night temps at 55F for a few weeks and a light leak I didn't know about.