Originally Posted by shredGnar
Temp 60 (colder than usual..assuming because the lights were out for 12 hours for the first time)
pH 6.5 .. a little high but I brought it down to 6.2 with some natural down..
EDIT: The drain pumps (in the controller bucket) failed and the buckets were filled for several hours, and they all appeared to be over watered. Any fix for this? They seem to be perking up now..
Your Ph is too high for hydroponics, so the yellowing you're seeing may very well be due to that. 5.5-5.8 is supposedly the Hydro sweet spot, with a lot of people tending to start at 5.2 and letting the ph naturally drift to 6.0 before ph-ing it back down again.
6.2-6.8 is more of a soil ph range, so if you're running E&F I'd get it lower.
As far as the pump failing and the plants exhibiting overwatering symptoms, they were probably just experiencing a lack of dissolved oxygen. Assuming you've gotten the pump working again, your res temps are cool enough, and everything is functioning as it should, they'll probably be ok.