LEDs and some Rockwool

baseless

Member
Whats up everybody?

So here is the deal. Im running 3 1200 watt led lights. 4ishX10ish table I made using 2x4s and corrugated roofing panels. 40 gallon res with a 700gph pump feeding 32 6x6 rockwool blocks. 6 different strains (which I think I made a mistake getting so many different). I have a carbon scrubber in the corner of the room venting out the window. No intake fan just the negative pressure caused by the scrubber. Temp in room doesnt go over 77f, RH high 30s low 40s. General hydroponics advanced nutrient system with cal mag in RO water is what im using. I put the clones in the blocks and ran the pump for maybe a hour. Ph 5.8 ppm 450. I get run off seconds after the pump turn on. Blocks were soaked correctly. Watered that night and continued twice a day. After two days I start to notice droopy leaves and some yellowing on bottom fan leaves, Mostly on the Andys OG and Cookies and Cream. 3 and 4 days I start to notice the yellowing travel up some of the plants (again Andys and CC) and some light green on the very tops of the rest of the plants . Tomorrow will be a week. Ive got purple on the leaf stems to the stalk and some purple lines down the stalk, but some plants like the Purple Urkle half the stalk doesnt have any purple. Also some of the leaves on the Yem OG are starting to curl down and appear to be twisting. The last time I watered was friday night, figured some of my problems might be cause im not letting the blocks dry out. Any tips or criticism is appreciated.
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GBAUTO

Well-Known Member
They definitely look like they are not happy. My hydro experience is with a 8 bucket RDWC system. When I have run multiple strains it can be very challenging to get a nutrient concentration that's tolerable for all of the plants at the same time. I had a run last winter with a sativa dominant strain along with the Aurora's and it was very sensitive to concentrations.
How do the roots look on the sickly plants?
 

baseless

Member
When they went into the blocks they were white and abundant. Plants were green as well. Since I havent watered today I will say they appear to look a little better.
 
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