Winter semi full term run

803AutoGrower So growth has been slower than normal but it has been cold outside and I’m noticing she looks a little yellow so filled the base with solution and top fed till runoff with 1/2 strength nutes so hopefully it’s corrects the issue. Any ideas as to the culprit would be greatly appreciated.

803AutoGrower So I noticed some damage on my leaves and I thought it was a watering issue but I checked my reservoir and my ppm had spiked to 5500 somehow so I flushed with 30 gallons of distilled water and my runoff was not 550 after 30 gallon. Ph was 6.2 and my substrate ph was 6.3. Idk how this happened as the only thing I did different was add the silica. Hopefully I haven’t killed her.