Help Needed! Ph problem? Pics

First grow on my own, everything looking very healthy up until few days ago, noticed some bleaching on a few of the larger leaves. Worst cases in photos started out looking like the newer photos. Only a few plants affected, and these are the taller plants. All have been receiving identical feed.

Water/feed has always been ph corrected. Soil was mixed with dolomite lime to begin with. Nutes are canna bio range.

Only using 6.5L planter bags though.. too small?

Using 600w son t agro, good ventilation. Some co2 added (candle). Growlush tent.

I'm just over a week into flowering.

Is this more likely to be a serious PH problem or were the lights just a bit too close? Any advice appreciated!

Notice leaves have started curling a bit too.

worst affected plant


started out looking like this, a different plant

FerndaleStranglers said:

First grow on my own, everything looking very healthy up until few days ago, noticed some bleaching on a few of the larger leaves. Worst cases in photos started out looking like the newer photos. Only a few plants affected, and these are the taller plants. All have been receiving identical feed.

Water/feed has always been ph corrected. Soil was mixed with dolomite lime to begin with. Nutes are canna bio range.

Only using 6.5L planter bags though.. too small?

Using 600w son t agro, good ventilation. Some co2 added (candle). Growlush tent.

I'm just over a week into flowering.

Is this more likely to be a serious PH problem or were the lights just a bit too close? Any advice appreciated!

Notice leaves have started curling a bit too.

worst affected plant

started out looking like this, a different plant

Click to expand...

im not sure but i wouldnt think it would be the lights as its the bottom leaves affected while the top leaves closest to the lights are fine. maybe try flushing with some ph adjusted water and check to see when the run off water shows at

See: http://www.420magazine.com/forums/frequently-asked-questions/100149-strawberry-cough-yellow-leaves-help-needed.html might be relative to your grow.

Jonus said:

See: http://www.420magazine.com/forums/frequently-asked-questions/100149-strawberry-cough-yellow-leaves-help-needed.html might be relative to your grow.

Click to expand...

Thanks for the responses, I have read about toxic tent syndrome and I can only hope I don't have it.

My problems are only with 3 of the 10 plants in my room. Wouldn't a toxic environment affect all plants?

are they all crispy and burned or are they smooth and "healthy" feeling..?

Toxic tents like any environmental issue affect weaker plants similar to how mite infestations can be more prominent on some plants and less on others.

However I am not saying that is the case here, but if they continue in that manner all the way up the plant then that must be considered at some point. Aside from than that it 'looks' like calcium and magnesium deficiencies especially the slight yellowing in the new shoots combined with the rust type burn on the lower fan leaves however the fact that you have dolomite lime in the soil is weird as that should release enough adequate calcium which is why my mind started drifting to other potential problems.

Do you have any idea what the pH is of the nutrients you are feeding them and what is the pH of the runoff coming out the bottom of the pot. Also how do you water, on a regular schedule or only when the pot is light.

btw, next time you water your plants, test the ph of the runoff.
even with ph balanced soil and ph balanced water, the ph will sometimes fluctuate.

Ok, just been in and flushed the sick ones, gave the others some water. All done with around ph6 water adjusted from tap.

Also, plants are in pb12's sorry, not pb10's.

Medium mix was Canadian Xpress Max Yield + Perlite + Dolomite Lime

Have always lifted plants and checked how wet soil was with my finger prior to watering... in all above pics soil is very dry and plants are due for a water.

Have given them a very mild foliar feed to hopefully help with the deficiency.

Water in =6. Water out =5.5. Approximates. As you can see from pics i'm using liquid ph test, far from ideal i know but i've recently been made redundant and money is tight. Will invest in a ph meter asap.

Have just noticed in the pic of the runoff ph it looks a bit redder than it did to my naked eye. Pic looks like runoff was ph5.

Now i'm doubting my judgement/eyesight against the camera. Grr wish i had a digital ph meter.

Tested the runoff for both sickest plants and was pretty much the same.

Sickest plants:



and



Rest of plants still look pretty healthy - pics prior to watering.



Water IN ph



Water OUT ph

Have feed once a week and watered once in between each feed when the pots were light & top 2 inches of soil dry

bump! need yo sort this one out!

Grow room Temps?

6.0 is low for soil. I would raise it closer to 6.5 ph.

I would also raise the lights. The plants look a lil heat stressed. There is a possibility it is light bleaching.