First cannabis grow using dwc. Some weird symptoms that i cant seem to understand

Hey guys. Newbie grower here. Bern growing tomatoes and peppers using dwc. This is my first cannabis grow.
I have two strains: jack herrer and biscotti. The jack herrer is showing more symptoms than the biscottie. I believe its a nutrient burn that caused it. But i just want to be sure.
Running SF2000 leds
master blend npk with calcium and magnesium
Rdwc system water sittinf at 20 degrees celcius.
Ec was 1.2 now down to 0.8. Ph is between 5.8 and 6.1.

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

do you dance with the ph?

amneziaHaze said:

do you dance with the ph?

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Well at first used to keep it at 5.8. I was then told to drop to 5.5 and allow it to rise to 6.3.

What kinda meter are you using? Cheap ones arent very reliable. I prefer the drops myself.

sharptater said:

What kinda meter are you using? Cheap ones arent very reliable. I prefer the drops myself.

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Honestly using blue labs ph pen. Ordered a new one since ive had this one for a year.

Jazz87 said:

Honestly using blue labs ph pen. Ordered a new one since ive had this one for a year.

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You can quickly check and calibrate your pH pen.
It should still be working fine after only a year.

Billy the Mountain said:

You can quickly check and calibrate your pH pen.
It should still be working fine after only a year.

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I calib once a week and rehydrate weekly

Jazz87 said:

I calib once a week and rehydrate weekly

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Ok, just surprised a 1 yr. old bluelab needed replacement.
I had one for 5+ years before getting stepped on

Billy the Mountain said:

Ok, just surprised a 1 yr. old bluelab needed replacement.
I had one for 5+ years before getting stepped on

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Just getting a new one to remove some anxiety

Looks like calcium to me as well.

Jazz87 said:

Just getting a new one to remove some anxiety

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I've got a nice meter but use GH pH drops 90% of the time; they're cheap, accurate, and never need calibration.
Even with a meter, drops are a nice sanity check if you think your meter is wonky

Billy the Mountain said:

I've got a nice meter but use GH pH drops 90% of the time; they're cheap, accurate, and never need calibration.
Even with a meter, drops are a nice sanity check if you think your meter is wonky

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Thanks for that. Ill defenitely look into it

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

We use same nutes i have same problems.it started when i had too high ppm and my ph was flying around.soo its one of those 2.full ress change helps. She usually eats one of the 3 faster then rest and when you refil you overconcentrate the ones she didnt eat.

How often do you change res?

amneziaHaze said:

We use same nutes i have same problems.it started when i had too high ppm and my ph was flying around.soo its one of those 2.full ress change helps. She usually eats one of the 3 faster then rest and when you refil you overconcentrate the ones she didnt eat.

How often do you change res?

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Hey thanks for that. Well after all these problems i have been changing once a week now. And i just top up with phd water. Defenitely changing the nutes for the next grow cuz these r good for just tomatoes i guess. The N content is too high in the calcium and P is insufficient.

What do the roots look like?

Jazz87 said:

Hey thanks for that. Well after all these problems i have been changing once a week now. And i just top up with phd water. Defenitely changing the nutes for the next grow cuz these r good for just tomatoes i guess. The N content is too high in the calcium and P is insufficient.

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Lol into gh flora nova bloom. Use it the whole grow. Nothing else.

Jazz87 said:

Hey thanks for that. Well after all these problems i have been changing once a week now. And i just top up with phd water. Defenitely changing the nutes for the next grow cuz these r good for just tomatoes i guess. The N content is too high in the calcium and P is insufficient.

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i add hesi pk. its a great nute last grow i had 90grams on 60W you just need some practice with it. its not the same amounts as for tomatoes. each strains likes different amounts.

Very dark green green says excess nitrogen. Don’t treat for deficiency until they respond to the lower EC. It could be some lockout of phosphorus or calcium.