Hi guys, this is my first grow and my plants have been doing great. But in the last three days my stems started to turn color (50% of my crop). I first thought is was a Phosphorus deficiency but after I fed them nutes still no budge and more plants are starting to show the same signs. Leaves are also starting to limp, but I doubt it's Nitrogen toxicity(leaves are on the lighter green side). I'm scared it might be some sort of root rot? PS. First plants leaves looks disformed because I fucked up the topping.