Ripper seeds brain cake

So a few days after I did the leaf strip I noticed that on the 2 smaller plants that there was a bit of yellowing in the leaves. So I pulled a all nighter to see if the tent was getting hot as I was running both a SF-4000 and SF-2000 in a 4x4 tent. The tent wasn't getting to hot, think it peeked at 26.5c, less then what my 3x3 tent was getting up to. The only 2 thing I could think was causing the issue was the reservoir temperatures because it was dropping down to 17.5c or the light intensity. So I removed the SF-2000 and ordered a 50w tank heater. The reservoir temperatures are now staying between 22c and 24c and aren't fluctuating as bad as it was before. The tent temperature has lowered a bit after removing the SF-2000. I also sprayed them down with a mix of 500ml water and .5ml of Advanced Nutrients Revive to see if it helped at all. Now since I've made all these changes I haven't noticed if it's gotten any better, bit it doesn't look like it's gotten any worse yet also. All I know is this well definitely effect my overall yeild of my plants. Oddly the only one that doesn't look effected by what's going on is the tallest plant in the tent. Sizes B.C #1 - 41" B.C #2 - 38" B.C #3 - 33" B.C #4 - 29" B.C#4 is the one that looks the worst rite now and has been the runt since day 1. B.C#2 might be the second tallest but it's showing a lot of stress rite now. It went from looking really good, to yellow, upwards claw leaves in just a few short days. Well that's everything for now. Happy growing everyone