I just did a res change today, in the beginning of wk 5 of flower. This plant is the only one affected that I noticed after the res change and have no Idea what happened. I walked in and some of the fan leaves up by the top colas were twisted and starting to brown between the veins in the leaves. Any advice anyone? I did flush with ph'd water and then refilled the res with an individually mixed batch but I sure would like to know what the hell happened and if anyone would do anything different.