Sick Plant. Need help. 1st Grow

th4k1ng said:

I have been scrolling this thread for along time now. Some of you guys offer some really good advice, so kudos to you. Unfortunately, I decided to overcomplicate things and may have screwed my first grow. Well at least 2 of my 6 plants. I have run into some, possibly major, problems during the flowering stage and dont know if i should cull at least 1 of these plants. First a little about my setup

2.4x1.2x2.0 tent
2x6 inch RVK intake and outake fans
6x purple haze auto
2x dual spectrum 600W
Medium=40% coco coir, 40% biobizz light mix, 20% perlite (Dont berate me for mixing. This is possibly the root of my problems at the moment. I know better for next time)
Biobizz Bloom
Biobizz Biogrow
CalMag
I have the temps (23-25 centigrade) and RH (40%) on lock

So now, herein lies my problem. Started off incredibly well for the first 7.5-8 weeks. Good foliage, slight nute burn but only on the tips (didnt we all do this as first time growers), overwatering was never a problem. No training, just let my babies shoot up to the sky. At around the end of week 8, two of my plants leaves started to turn yellow which i thought was normal as they were all flowering. It was only when they all turned yellow that I knew I had a problem. Then one of the plants leaves started to display black blotches on the leaves. Considering they only have possible 2 weeks max left till harvest, I wanted to get any advice on what to now do with these 2. I flushed them both a week ago but to no avail. Theyve become worse with one becoming considerably worse.They are still producing trichromes and the pistills are just starting to change colour. Im leaning towards a pH problem, nitrogen deficiency and phosphorous deficiency., but im posting to get your guys views on it. Thanks for reading.

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