Save my babies - QB & DWC

[Waira]

...how close are the lights? necrotic patches that high up could be Ca defc. too, definitely some overlap in symptom appearance between them,... Ca is nearly immobile within the plant making it hit uppers more first and worst,: P is fully mobile, but symptoms can manifest higher up often ass not, unlike n defc.,... Overly strong light will magnify or cause Ca defc, issues, and it's possible to over do Ca-mg which starts other lockout type issues,... a tough balance sometimes, as LED for sure seems to elevate Ca demands....
As mentioned previously, and again above, your res' T is off, and the drifting pH is making matters worse too,...
I'll see if i can get a hydro guru in here to help advise, as I'm a soil guy!

 

[ver151set]

Thanks guys, I wrongly assumed hydroguard would make me immune to higher res temps.

The lights are 24" but dimmed to 35k lux at canopy. I could raise them and turn up dimmer but that would increase energy/heat.

I had forgotten not too long before I was the droopiness/deficiencies i had increased lux from 25k to 35k, maybe I should back it off

 

[STILLSMOKIN]

Thanks guys, I wrongly assumed hydroguard would make me immune to higher res temps.

The lights are 24" but dimmed to 35k lux at canopy. I could raise them and turn up dimmer but that would increase energy/heat.

I had forgotten not too long before I was the droopiness/deficiencies i had increased lux from 25k to 35k, maybe I should back it off

I would leave at 20 to 25k lux until flower and them gradually increase 5k lux a week and watch for issues. My experience with indica dominant is lower light happier plant. Sativa can't get enough you can hit those from seed with 40k most times.

 

[Mr Green Fingers]

Thanks guys, I wrongly assumed hydroguard would make me immune to higher res temps.

The lights are 24" but dimmed to 35k lux at canopy. I could raise them and turn up dimmer but that would increase energy/heat.

I had forgotten not too long before I was the droopiness/deficiencies i had increased lux from 25k to 35k, maybe I should back it off

Hey if your in UK or Europe have a look into iceline tubing for your airlines as claim to decrease res temps, I've been using it for a couple years now and res temps are perfect, for £0.55 per metre you cannot go wrong, or you can freeze bottles of water and drop in the res to bring down temps

 

[MrMrMr]

Welp I changed the res, same ppm but different ratios. Based it off Lucas this time instead of 1:1:1 flora

Ro water 11 ppm
Calimagic 7.5ml 160 ppm
Micro 8ml 302 ppm
Bloom 16ml 410 ppm
Hydroguard 8ml

Temp 79 55%rh

Hay did u get it figured out?
If not it looks to me like they need to be flushed, and the nutes brought down. The tips are discolored, which indicated nute burn. Ive seen alot of guys feed 300, 400, and 500 ppm but mine don't like anything over 250.

 

[MrMrMr]

Hay did u get it figured out?
If not it looks to me like they need to be flushed, and the nutes brought down. The tips are discolored, which indicated nute burn. Ive seen alot of guys feed 300, 400, and 500 ppm but mine don't like anything over 250.

Oh and bring that bloom feed waaay down in veg and way up in flower.

 

[Mañ'O'Green]

Here are some things that might help. First you need to stabilize the PH a little better by aerating the water with an air pump and stone for a day or two before you use it. This will precipitate some of the calcium carbonate out before it happens in the reservoir. If this precipitation is taking place in the reservoir PH will wander more.
I have done DWC with higher res temps than you are dealing with so It can be done. It is not ideal. The Botanicare HydroGuard protects against pythium in the higher temperature water and does not augment O². Try to keep RH between in 40% - 60% in the tent. Get an EC meter to measure your nutrient strength (not a PPM meter) EC measures nutrient strength PPM is a dissolved solids meter. They are different. Here is a chart I used when I grew with GH and it worked well. I used 80% of the vendor's suggested strength. Remember to use ALL of the products in the simple program as a minimum. The amounts are given in ml/gallon/80%
be sure to multiply by the amount of water in your reservoir. for example you have 4 gallons of water in your res for week 3 you need 16ml FloraMicro, 16ml FloraGrow, 8ml FloraBloom, 8ml Rapid Start, and 3.2ml Flouralicious Plus and 8ml HydroGuard.

Hydro is the least forgiving style of growing but it is also the easiest to fix when things get out of balance. Good luck and tag me if you have questions.

The PPM range on the chart is from GH and they are too high I think 850 PPM is a maximum for autos.