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I ran into something similar in veg. I upped to full strength, 2.0 with Jacks 321 and RO water, 84F temps, 55-60 humidity, but with an LED light. Had to reduce once i switched to flower though to 1.2 to 1.5. Need more info and im sure more experienced users will chime in. Light source? Also...

Temps and relative humidity? Don't mean to harp, but i had issues with LED's with lower temps and/or wrong humidity levels.

First thought was calcium deficiency, but would wait for master blend growers to chime in. What is you ambient temps and RH?

Nice diploma

I just did two strains with similar, alleged, finish times, 2 different breeders. (My mistake) 1 finished almost 3 weeks earlier than the other. First finisher was more sensitive to nutes, other seemed to take whatever i could give her. Going forward I am only running 1 strain at a time on a...

Harvest them bitches

LED light? I would get your air temps to 80-84f. Seemed to work a lot better for me, and others from what I've read.

Lol. Well this thread should get interesting soon.

Light source and intensity?

Ah.... Well I have no experience with root pruning or what effects may occur. She appears to be a monster for a 5 gal bucket. IMO. What concentration of nutes, temp, humidity, light source?

Why you pruning roots?

I wouldn't put it at full power until at least 2-4th week of flower. Ran my true 400w less than 50 for veg and it worked good.

The controller has an upper and lower limit you set for a certain time period which i coordinated with the timing of the lights. So the heater only kicks on when it drops below a certain temp, and shuts off when it gets to a certain temp. Same with the exhaust, comes on when a temp is reached...

I dont trust the devices sensors, and they are not usually positioned in the right spot to read. Plug the heater onto a controller. Get a better result doing so. Edit: The picture i posted has a sensor so it will turn on and shut off the heater based on temp readings, and can be set for a day...

I have 2 of these. 1 for exhaust and 1 for heater. I can set a certain temp for certain parts of day, ie daytime/nighttime. They kick on automatically. Been working like a charm. When a power outage occurs, the settings get stored so i just have to go in, adjust time, and hit go.

I have exhaust fan and heater set to temp controllers to auto turn on and off at preset temps and time. Also have dehumidifier set 55-60 and a humidifier set at 45-50 to help keep RH in check. Seems to work alright.

I use two of these for a supplemental heater and carbon filter exhaust to help cool. Kind of helps "automate", and not rely solely on temp gauge of heater... Works pretty good and regulates where i want the environment to be.

I have to use a space heater to supplement, especially in the winter. Less than ideal, but your plants will thank you for it.

Can you get your air temps higher? When i switched to LED my growth was stunted and had problems as i was low 70's. Got the temps up to 80-85 and a lot of issues went away.

What are your relative humidity? I would get the temps up to about 80-85 with LED.