I'll bet money res temps are not your problem. I've seen res temps MUCH higher than that using Waterfarms w/no issues at all. 72-75* is perfectly fine. The leaf yellowing is a nute issue, root rot (if u have it) I bet is from light leaks as mentioned above, but the res temps aren't the issue for sure. Best of luck.
Silent-Smoker Reviewed by Silent-Smoker on . Cool Works Ice Probe for Waterfarms I have a waterfarm setup. 4 modules, recir. with the great help of people on here. All of my temps, nutes, ppm, ph are good but it looks like I am getting root rot and its the 1st week! So, I have adding freezer packs (placed inside of ziplock baggies) to help keep the water temps down. Without I am around 72-75 deg. That shouldn't be enough to cause yellowing on all leaf edges, but it looks like it is. Upon reading posts regarding water chillers, I came across this nifty little item. You can Rating: 5