What the hell is going on? Please help

[Conformist]

Over the last two weeks, something has spread all over my garden and i don't know what it is or how to deal with it.

First, a bunch of dark green/black dots appear all over my leaves then, those dots turn into burnt spots and kill the leaf.

I don't know exactly what the problem is but i have been having trouble with pH fluctuations caused by a poor quality pH down.

What i would do is, pH the water to 6.3 and water the plants but here's the thing, the water i gave them would go back up to 7.0 a few hours later and that's when i noticed my plants started turning to shit.

I can't take a proper picture of the dots I'm talking about but, here's what it starts to look like a day or two later.

[FONT=Arial, Helvetica, sans-serif]How long has this problem been going on? 2 weeks
Are you growing in a PVC grow tent? (example: Hydrohut or any other non brand tents) Secret Jardin Dark Room 90 II
What system are you running? (DWC? Ebb flow? Aero? Water Farm? Flood Tables? and so on...) Hand Watering
What STRAIN are you growing? Nirvana - White Rhino
What was the establishing technique? (Were the seed or clone?) Fem Seed
What is the age of your plants? 61 days old
How long have they been in there mixture they are in now?(coco,soiless etc..) 61 days
How tall are the plants? 2 feet
What PHASE are the plants in? (seedling, vegetative or flower) are the plants in? Flowering
What Technique are you using? None
What substrate/medium are you using?(Hydroton, RockWool etc.) Pro-Mix / 75-85% Spaghnum Peat Moss, Perlite, Limestone
What is the Water temperature? Room Temp
What color are your roots? White? Brown? Are your roots slimy? White
What Nutrient's are you using?(If growing soiless) Maxibloom & Pro-Tekt Silicon
How much of each nutrient are you using with how much water? 7g Maxibloom, 1ml Pro-Tekt 1 gal / 4 liters at 6.3pH
How often are you feeding? (If using soiless) Every 15 days
How often are you giving nutrients? (If using soiless) Feed wait 5 days, Water wait 5 days, Water wait 5 days etc..
When was your last watering? between 1 days and 5 days
What is your water temps? Room Temp
What size bulb are you using? 400w HPS
How old is the bulbs you are using? 61 days old
What is the distance to the canopy? 1 feet
What is your RH Factor(Relative Humidity)? 32%
What is the canopy temperature? 78F
What is the Day/Night Temp? (Include flucutaion range) 68F - 80F
What is the current Air Flow? (cfm etc.) 300cfm
Tell us about your ventilation, intake exhaust and when its running and not running ? I have an open intake window on both sides of my tent, a small 6" clip-on fan and a 440cfm dimmed to 300cfm Can Fan 6" HO exhaust
Is the fan blowing directly at plants? No, above the canopy
Is your water HARD or SOFT? Soft, 7.0pH
What water are you using? Reverse Osmosis (RO)? Tap? Bottled? Well water? Distilled? Mineral Water? Tap
Are you using water from a water softener? No
Has plant been recently pruned, cloned off of or pinched No
Have any pest chemicals been used? If so, What and When? No
Are plant's infected with pest's No[/FONT]

 

[oscarthegrouch]

I had a similar problem a while back, once I got my ph in check everything went back to normal. Have you checked your run off?

 

[Conformist]

I had a similar problem a while back, once I got my ph in check everything went back to normal. Have you checked your run off?

I just did.

The plant i watered yesterday with a new formula, 6.3pH. (Where it should be)
The plant i watered 3 days ago using the old formula, 7.0pH.

I'm pretty sure it's pH related as well but, I'm looking for a confirmation.

 

[nachoconqueso]

I say pH. It's almost always the first place to start, especially if you're already feeling like it is that. Be patient with it. If you do fix the problem by adjusting the pH it may not show you that right away. Sometimes I like to wait 4-5 days to observe growth before I make another adjustment.

 

[dansbuds]

Yup .... get a good PH adjuster like AN's PH up & down & get your PH in the right range & you'll be fine again .

AN's PH adjusters are some really concentrated stuff !!! it doesn't take much to get the PH in range ... a couple drops most times . i've had my bottle almost a year now & i mix 25 to 30 gallons every 3 or 4 days .

 

[vapor]

some strain like to be dryer the others///

 

[Conformist]

I'll definitely buy a new pH Down bottle but in the mean time, i think I've found a way to fix my pH issues because the plant i watered yesterday still has a perfect 6.3pH run off.

However, i gave water to half of my plants not long ago so it could take 6-7 days before i can fix their pH imbalance.
I think I'm gonna have to flush them.

 

[vapor]

does it take 6 or 7 daze for you pots to dry out?

 

[Conformist]

does it take 6 or 7 daze for you pots to dry out?

When they're sick, yes.
2 weeks ago they would drink a gal of water every 3 days but now, their pots is taking longer and longer to dry.

 

[medicalmj]

Looks sorta like a Phosphorus problem, perhaps caused by high pH or low water temps. The reason is that you have the issue at the edge of the fan leaves and it's blueish/black. Do the leaves curl up and get crispy after becoming affected? The "dots" that become necrotic sounds like calcium. Both Ca and P are consumed much more in flower and can be locked out by pH imbalance.

When ever I soilless media, like Pro-Mix, I feed every time I water. My EC is around 1.0-1.1 net (starting .3, 1.4 gross). I flush every couple weeks to make sure no salt build up. That way plant always has fresh nutes.

 

[Conformist]

Looks sorta like a Phosphorus problem, perhaps caused by high pH or low water temps. The reason is that you have the issue at the edge of the fan leaves and it's blueish/black.

They could be hungry.
I had to deal with nitrogen toxicity in veg so i decided to calm down a bit on feeding.

Last time i fed them was about 15 days ago.

Do the leaves curl up and get crispy after becoming affected?

They are crispy but the leaves tip are curling down.

When ever I soilless media, like Pro-Mix, I feed every time I water. My EC is around 1.0-1.1 net (starting .3, 1.4 gross). I flush every couple weeks to make sure no salt build up. That way plant always has fresh nutes.

Alright, I'll give it a try. Thanks

 

[bluenorth]

When ever I soilless media, like Pro-Mix, I feed every time I water. My EC is around 1.0-1.1 net (starting .3, 1.4 gross). I flush every couple weeks to make sure no salt build up. That way plant always has fresh nutes.

What ph do you use in promix?

 

[Conformist]

I flushed and fed them yesterday.
The leaves are starting to go back to their original color however, the plants all look awful.

So awful i don't think I'm even going to update my grow diary today. lol