Tbone
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I have looked at the flame on the burners ( this problem is happening in both rooms)They appear to be burning blue.In the other thread, the OP was using a burner for co2 and was not having the proper flame from the burner causing issues.
A few things. 800ppm is way to strong for a rdwc system. Also your humidity is a little low but I don't think it's the culprit here. Lastly is your air pump in your sealed room? If so it's pumping co2 into your system, that's no good.
If it was me here is what I would do, listed in order of importance imho. Move air pump out of the room so it's not pulling co2 enriched air into the system. Drop your ppm so you max out at about 400. Dont let your ph shoot above 6. Stay on the 5.5-6 range. And lastly raise your rh to 70-75 range if you want to run your room at 83 to get your vpd in a more optimum range. I personally like to run my room at 77 and rh at 70 until flush then I drop the temp to about 72 and the rh to about 50. Hope this helps and good luck!
I also run a closed environment with co2, starting at 1200 and dropping to 400 the last couple of weeks. I've never run into an issue like this. To me it looks more like a nutrient deficiency, possibly P and/or K. Are you seeing any red stems on your leaf stalks or red streaks running up the main stalk? I'm not familiar with the nutes you are running but would suggest you compare the amounts of P and K you are feeding to House & Garden and Current Solutions, which I've found to both work well in these systems. I've never run into deficiencies of either element over a variety of strains using them.
That's a hell of a high dead band setting. I have mine set at 50ppm on my fuzzy logic controller. Tou want to keep that ppm at your desired set level all thru lights on with minimal swings to allow the plants to absorb the proper co2 saturation.
Its a new day and I have kind of re-thought the co2 thing. Im back on a nutrient def. problem. I have to agree, I should want to set everything in the enviroment without too much fluctuation.
Did you ever drop your ppm from 800? That's crazy high for under current. If you called the folks over At cc I bet they would agree. Also less is more in that system. You basically just need base nutes and calmag if running ro, and MAYBE a booster during peak months. Kiss is best with your setup
This last grow is almost complete and it will be a little while until I flip to flower and experience this problem again. I am going to make a couple nutrient adjustments and see if I get any improvements.
Change Cal Mag brand with lower N
Then up the cal mag
Then if the deficiency still starts showing up, just up the P and K .
Try to run a little lower ppm's in general
Once I resolve this I promise to come back with results.
Thank you everyone for all the help so far.
Coming from soil growing my instinct was to run high ppms when I first started with rdwc. I quickly learned that less is truly more in these systems as they are so efficient. I run a separate veg system and cloner. Once I move from the cloner to the veg system I start at about 200 ppm (500 scale). When I move them to bloom I generally start around 300 ppm and by week 5 or so, when they are at peak feeding, rarely go over 550. I check my pH and ppm every day and look for the pH to slowly rise while the ppm falls. Day to day it's not much, maybe a .2 or .3 pH increase and a 5-10 point drop in ppm, depending on how heavy they are feeding. If the readings are going in the other direction it's a good bet my nutes are too strong. Nutrient levels that are too high will cause nute lockout, which can look like a deficiency. It's so much easier to increase ppm as opposed to dropping ppm.
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