Desperately seeking help identifying these problems

:mad::mad::mad:
1. Pictures bellow (all of the same plant) â?? Hindu Skunk in flower week 4. Everything looked great until one branch on one plant, after starting to develop buds, leaves suddenly discolored and pistils turned black. It almost appears like a seed pods but they are not â?? these are buds without pistils. I flushed and so far no improvement.
[attachment=o245353][attachment=o245354]

2. Pictures bellow â?? White Widow in veg. After 3 weeks, it suddenly started looking strange. I flushed and changed to PH adjusted R/O water but no improvement. As you may notice in the pictures, new growth looks grayish/yellowish and not healthy. Older leaves are â??clawingâ??, became very narrow and dark. None of the leaves turned yellow nor died.
[attachment=o245356][attachment=o245355]

3. Picture bellow â?? Kushage in flower week 4. While buds are looking good all leaves on the entire plant look just like in the picture.
[attachment=o245357]

1. Are you growing from seed or clones? - clones
2. How old are your plants? â?? Hindu skunk â?? 4 weeks in flower; White Widow â?? 4 weeks in veg; Kushage 6 weeks in flower.
3. How tall are your plants? Hindu Skunk â?? 2 feet; White Widow â?? 1 foot; Kushage â?? 4 feet.
4. What type of hydro system are you using? â?? 6 inch rockwool cubes in veg and in flower 3 foot rockwool slabs under the 6 inch cubes. 15 gal per tray with water pump on a timer to feed 10 min. every 12 hours.
5. What brand/type of nutrients are you using? Veg 15 gal -- Advanced Nutrients Sensi Grow A&B

Week 1 - EC 1.14/PH 5.8
Sensi Grow A&B - 70 ml each
H2 (Humic Acid) - 55 ml
Hygrozyme - 100 ml
SM-90 - 30 ml
Dark Energy - 35 ml

Week 2 - EC 1.42/PH 5.8
Sensi Grow A&B - 95 ml each
H2 (Humic Acid) - 55 ml
Hygrozyme - 100 ml
SM-90 - 30 ml
Dark Energy - 35 ml

Week 3 - EC 1.57/PH 5.8
Sensi Grow A&B - 110 ml each
H2 (Humic Acid) - 60 ml
Hygrozyme - 100 ml
SM-90 - 30 ml
Dark Energy - 35 ml

Week 4 - EC 1.71/PH 5.8
Sensi Grow A&B - 120 ml each
H2 (Humic Acid) - 70 ml
Hygrozyme - 100 ml
SM-90 - 30 ml
Dark Energy - 35 ml

Flower 20 gal â?? Advanced Nutrients Sensi Bloom A&B

Week 1 - EC 1.14/PH 5.8
Sensi Bloom A&B - 100 ml of each
H2 (Humic Acid) - 75 ml
Cal-Mag - 75 ml

Week 2 - EC 1.52/PH 5.8
Sensi Bloom A&B - 130 ml of each
H2 (Humic Acid) - 80 ml
Cal-Mag - 75 ml
Big Bud powder - 24 g

Week 3 - EC 1.61/PH 5.8
Sensi Bloom A&B - 135 ml of each
H2 (Humic Acid) - 85 ml
Cal-Mag - 75 ml
Big Bud powder - 25 g

Week 4 - EC 1.71/PH 5.8
Sensi Bloom A&B - 170 ml of each
H2 (Humic Acid) - 90 ml
Cal-Mag - 75 ml
Big Bud powder - 27 g
Phosphoload - 40 ml (one week only)

Week 5 - EC 1.71/PH 5.8
Sensi Bloom A&B - 170 ml of each
H2 (Humic Acid) - 90 ml
Cal-Mag - 75 ml
Big Bud powder - 27 g

Week 6 - EC 1.42/PH 5.8
Sensi Bloom A&B - 120 ml of each
H2 (Humic Acid) - 75 ml
Cal-Mag - 75 ml
Overdrive - 150 ml

Week 7 - EC 1.14/PH 5.8
Sensi Bloom A&B - 95 ml of each
H2 (Humic Acid) - 60 ml
Cal-Mag - 75 ml
Overdrive - 120 ml

Week 8 - PH 5.8
Flush

6. What is the Ph of your nutrient solution? 5.8
7. What is the PPM/EC of your tap water? I use a 4-stage R/O water
8. What is the PPM/EC of your nutrient solution? As per AN recommendation (light feeding regimen for flower)
9. What is the temperature of your nutrient solution? 68-73
10. Does your PPM/EC show a rise or fall when you do your daily PPM check? Fall for the most part.
11. Does your pH show a rise or fall when you do your daily check? Veg â?? rise for the most part; Flower â?? rise for the first few weeks and then fall slightly to 5.5-5.7 range. About 2 weeks ago, my Hanna meter started showing nonsense and during that time the PH may have been totally out of control, dropping to as low as 4.9. I replaced it with brand new BlueLab, which works perfectly.
12. Do you foliar feed or spray your plants with anything? No
13. What kind of lights do you use and how many watts combined? (HPS, MH, fluorescent, halogen, incandescent "plant lights") Veg â?? fluorescent T-5 8 bulb fixture per 2x4 tray. Flower - Hortilux HPS 1000 with XXXL air cooled/vented reflector per 3x6 tray.
14. How close are your lights to the plants? Veg â?? 1 foot; flower â?? 2 feet.
15. What size is your grow space in square feet? Veg 50; flower 50.
16. What is the temperature and humidity in your grow space? Veg â?? 74-80 F, 50-70% humidity; flower â?? 71-80 F, 50-65% humidity (sometime, during the dark time, it spikes up to 75%, I am working on controlling that).
17. Have you noticed any insect activity in your grow space? No
18. How much experience do you have growing? Few successful crops.

Thank you in advance for your help.

it looks like nute burn to me. are you following advanced nutrients aggressive feeding regimen? did you look at your roots? your plants look pretty bad and dont know if they are going to recover. you could try flushing then use 1/4 strength with only sensi a + b and calmag.

Quote:

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Originally Posted by cigarettes42

it looks like nute burn to me. are you following advanced nutrients aggressive feeding regimen? did you look at your roots? your plants look pretty bad and dont know if they are going to recover. you could try flushing then use 1/4 strength with only sensi a + b and calmag.

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Thanks for your input. I follow a regular feeding regimen in veg (White Widow problem) and light feeding regimen in flower (Hindu Skunk and Kushage). I flushed WW for about a week and she didn't recover. Roots looked white, solid and very healthy but growth has stopped completely. I am at a total loss here. I suspect some kind of an ozone problem. What do you think? I have a very good air circulation but I donâ??t do any air exchange.

What are your thoughts regarding Hindu Skunk and Kushage?

Your thoughts and suggestions are greatly appreciated.

wow no air exchange? i would try getting some fresh air in. if you get it from outside put some panty hose on your duct cause its summer and the bugs are out! also still lay off the suppliants for now. sensi has a bunch of basics in it so you shouldnt use em if your having problems

Quote:

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Originally Posted by cigarettes42

wow no air exchange? i would try getting some fresh air in. if you get it from outside put some panty hose on your duct cause its summer and the bugs are out! also still lay off the suppliants for now. sensi has a bunch of basics in it so you shouldnt use em if your having problems

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:thumbsup: Great suggestion regarding panty hose, I'll do that. I flushed - 1st 2 flushes were continues and never recycled back to the same reservoir. 3rd flush is now just finishing the week and nothing has changed (EC is virtually 0). This is why I am suspecting a possible ozone problem. What do you think about Hindu Skunk and Kushage problems? Have you seen anything resembling these issues?

Thanks.

Sensi Grow AB has Cacium Nitrate, Magnesium Nitrate, and Magnesium Sulfate in it. I'm not sure what your ratio of additional CalMag is compared to the amount in Sensi, but if Ca or Mg is overdosed it can cause lockout issues. Just a speculation.

how close are your t5s?

whoa i just missed something while reading your problem!! your only irrigating for 10min every 12 hours??!?!?!?!?!? wow i think that is a huge problem! in veg i flood 8 times for 15 minutes and flower 4 times for 15 minutes!! so basicaly im flooding for 15 minutes every 4 hours. with your slabs i would ATLEAST flood 6 times a day for veg or 3 times for flowering. i am almost %100 positive your under flooding and thats the sole problem you have

Does over nut and over watered look like a reasonable cause for these symptoms .