[Resolved] Falling on my face with dying plants

Third times not a charm… Having issues….In late veg, early flower…Some plants yellowing, some are stunted with yellow leaves and some brown spots, but they all stop growing at some point. Using spring pot xls for all at the moment but I have a 8 sight 3 gal plastic pot setup I have yet to use, just in case I can’t get this system to work I am sending it back, hope not. I have flushed all the plants and reset and still the same problem. I have tried 3 different nutrient lines with all the same results also varying the strengths of the fertilizer. I left one plant out and top fed with drastic improvement overnight and zero problems to harvest using the nutrient solution from the res feeding the Autopots system. The ones in the Autopots didn’t do as well. This is my 3rd run and all the same results. I have about $1000 wrapped up in this and I might dump it on eBay and go with a FloraFlex system unless someone has a solution.

Heres my situation:
4 plants in a 4×8 tent, 2 ROI e680 led fixtures 2′ above canopy running at 80%. FloraFlex nutrients currently, used CX Horticulture and Canna in previous attempts. Res temp is kept at 69 degrees F via chiller with 2 1350 gph res mixers. Lights on temps are 79-80 degrees F and RH of 60-65 and night temps are 72-73 degrees with RH at 52-55. I also supplement co2 using a controller set for the appropriate climate and run times. I insulated under the tent floor so I don’t have to place the pots on lifts. If anyone can help me out it would be appreciated greatly. Thanks!

I have grown in DWC for the last few years with my lights and everything set the same…nutrient strengths are a bit different, but aside from that in DWC I veg for less than half the time and I have got great results with very minimal problems. I just don’t want to deal with all the power and attention this system needs that’s why I went with Autopots….Hope I can get this turned around quick