Deluxe Sugar Cane & OrangeVelvetUndergro

So excited about the growth and results of LST that I didn't even notice the yellowing of leaves beginning. I foolishly thought the red stems were also linked to the strains. Weather was extreme this week. Flooding everywhere in my city. Grow area was humid and cold (65 to 70% at 13 to 15c), tent was similar. Decided to buy a small PTC heater that wouldn't take too much electricity (400w) and place it by the induction hole/net to heat up and dry and the incoming air into the tent. It worked really well! VPD was sitting pretty but then I became restless about a heater staying on all the time. Found a Humidty and temperature controller locally the next day and wired my heater into the controller which would now act as my switch when the tent fell out of my parameters. Temp set to not go lower than 17 Humidity not to exceed 62% This has kept my tent consistently in the 18 to 23c range and humidity ranges from 50 to 62. Some days dont even need the heater at all. But my leaves really started to yellow and my stems have always been red. Bought a ppm meter and low and behold, my water was too soft and nit enough nutrients were being added for how big my plant is. I tested my Runoff and both plants were at 7.2ph, so my soil meter has been incorrect the whole time. Plan is to get the soil back in range of high 6's and then get back on nutes asap.