Royal Queen Northern Lights

Hope everyone had a great Christmas!!! We have had some crazy cold weather here the last 4 days and for the first time in 13 years had snow on Christmas day. So with the cold and snow came grow room issues. My grow space is outside and not attached to the house so maintaining a proper temperature and humidity has been a bit on the difficult side. Even with the lights running 24 hours, it's had a few drops down to 19c and the humidity has gone up to 68% a few times. Now luckly I'm still in veg and the humidity isn't a issue yet but the temperature has been making me worried. Going to put togther a heater with its own temperature switch increase it drops below 20c. Did some training over the last week with some LST and FIMing. With the LST every 3nd day I've been adjusting them and pulling the plants back a bit more and more. Since I don't think I'll be able to set up a SCRog net this go around (spent to much for Christmas and wont be able to affordthe PVC tubing) ive got to figure out something else and fast. Plants are getting big and it's going to get hard to bend then properly without braking stuff. Because I was showing some issues with 2 of my plants I started adding a bit of Revive to my res to see if they get better and they have. But because of the cold that's been hitting us my tank has had a hard time staying warm. Even with my 50w tank heater it's been fighting a up hill battle because the area outside the main room where the tank is, has been sitting around 14-17c. So with that the air pump I use to circulate the tank, it is pulling in cold air and thats been fighting the tank heater in getting it up to what I like it at. I tried using my water pump instead of the air pump for circulation and the res went up to 25.6c soooo I would much rather have 19c res then water that could kill my plants. So let's talk about the plants themselves. Both Special Queen plants are doing great but as you can see from the picture, one is doing absolutely amazing. Great growth (understatement) and has bounced back from training like a pro. The other plant is still doing really good when compared to all the other plants in the room but still could be a little bit better. Depending on what I'm going to do for supporting the plants this might be the last week of veg. Well see. So this plant was doing great and then about 2 days ago I started to notice issues. Almost looks like leaf rust or a Ph problem but ive tried my best to keep them correct and I'm hopping that like my Ripper badazz plants that they well just grow out of it. Doing a big clean up today in the room so I'm going to keep my eyes open for any pests just incase that's the issue but fingers crossed it isn't. Well that's everything for now. Happy growing growmies!!!