Leaves curling, burned tips- Coco (healp)

[Growmcnoob]

-Problem: Couple of plants got slight curling-tacoing problem and burned tips from before feedings. Also thrips infestetion in lower areas. I wasn't circulating the bottom of the tent enough i guess. Getting mold time to time. Hopefully fixed it by placing a strong fan at the bottom. Also a little VPD issues. (sometimes i find water on leaves)
-Medium/grow method: Soilless Coco (almost full coco)
-Feed and supplements used: Canna Coco A+B, Rhizotonic, Cannazym, Canna-boost (i mistakenly put cannaboost to a couple of non flowering plants also one time) Watering them by hand. 3lt water every day mostly. Giving them 1/2 of canna light feeding right now. Water PPM: 80 Solution PPM:450-550 Solution PH: 6.0 Run-off PPM: 400-850
-Water source: Bottled water from store PPM: 80 PH: 7.3
-Strain and age: Mephisto Genetics White Train 3x, MG Ripley's OG 3x, Auto Afghan Mass and a Critical Ogre around 45 days
-Climate: Day: 24-26 C Night: 20-24C RH: 45-55
- Light used: 1000W+600W HPS. Also supplementing with Co2. Switched to 20/4 schedule two days ago.
-Additional info: This problem have been around for like 2-3 weeks. I feel like Canna nutes are causing this since it began when i started to feed them 1/2 but ppm is really low... Also my pepper plant which is in coco experiencing the same problems much more severely after i fed them with like 1/4 canna coco nutes...

I want to fix this guys I did what I could over couple weeks but it was in vain. Now I need your help AFN!

--Pictures

 

[namvet25]

Light used: 1000W+6000W HP

What do you mean by 1000 6000 hp?

 

[Growmcnoob]

What do you mean by 1000 6000 hp?

uh 600w hps sorry ^^

 

[namvet25]

uh 600w hps sorry ^^

Thats better.Your plants look really good but make sure there not to close to the lights,this will cause cupping from heat and light stress.

 

[Growmcnoob]

Thats better.Your plants look really good but make sure there not to close to the lights,this will cause cupping from heat and light stress.

Lights are at 40-45cm closest and 70-75cm farest to the canopy. Running really good exhaust fan so heat isn't an issue.

 

[Waira]

... hmmm,... T and RH% are okay,... light distance a little close to OK,.. it's not always heat, it can be sheer intensity of the light as well,... is it only the uppermost leaves showing the edge curling? I don't think this is nutritional in any case,... could be the CO2 is causing this reaction as well, even indirectly,... breeze at the tops not strong is it?

 

[Growmcnoob]

Not too much but maybe since i got my new fan yesterday. It is circulating tho. But problem was there when it wasn't that windy too. Problem is on the new growth and a little below. Same problems where the lights don't hit directly. New check today: RH is between 45-50. Today my biggest plant which i topped three times and 6 top colas atm showed yellowish-whiteish spots on top fan leaves. Checked run-off: its ppm is 400 which i think is a little low? Do you think she hungers for food? I'm going crazy with all these issues man...

 

[Growmcnoob]

New Run-off test results: Plant [HASHTAG]#1[/HASHTAG] PPM: 1300 PH: 6.13 | Plant [HASHTAG]#2[/HASHTAG] PPM:1150 PH: 5.97

So run-off is ok? Maybe 1300 is a little high?

 

[Waira]

...what brand of TDS is it? problem is, the ppm standards are not universal, like EC is,... 1.0EC = 500ppm (USA-?), 640 Eutech, 700 Truncheon

.... in coco, like hydro you're feeding fairly weakly, frequently usually,... my coco guru says he may go as high as 1.7EC late bloom, pH 6.0,.. but in any case, that run-off % is critical,... he says no more than 240ppm higher than your inputs, to avoid build-up that can cause problems with pH, nute uptake, defc.'s,... So, I'd say that's a bit high,... plants still look OK, no sign of nute burn? Did you give heavy feeds since last time, which was 400ppm on the r-o? .... get me pics of the new symptoms mate,...

 

[Growmcnoob]

...what brand of TDS is it? problem is, the ppm standards are not universal, like EC is,... 1.0EC = 500ppm (USA-?), 640 Eutech, 700 Truncheon

.... in coco, like hydro you're feeding fairly weakly, frequently usually,... my coco guru says he may go as high as 1.7EC late bloom, pH 6.0,.. but in any case, that run-off % is critical,... he says no more than 240ppm higher than your inputs, to avoid build-up that can cause problems with pH, nute uptake, defc.'s,... So, I'd say that's a bit high,... plants still look OK, no sign of nute burn? Did you give heavy feeds since last time, which was 400ppm on the r-o? .... get me pics of the new symptoms mate,...

Oh I am definetely getting nute burns bro. I just got them today around 600ppm. :/ Can you believe it? Here are few clear pics of symptoms. Two out of one watering (i water twice every day) i get run-off, so daily. My ppm meter is xiaomi tds meter so i don't which measurement it uses. I doesn't specify on the manual.

I actually talked to someone experienced about my issues and he told me that I had magnesium deficiencies for sure and I was over driving my plants at that time with all the hid lightning and co2... When I opened this thread they were 70-80 cms, now they are 130+ and they were topped... I can't raise my lights any further and some colas are 10 cms away from lights... thank god they are running so cool and they can't even burn my hands just below the cooltube.