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Leaves dying, what's happening?

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- Wed, 15 Aug 2018 02:29:10 EST 7XvOeivC No.146257
File: 1534314550153.jpg -(639939B / 624.94KB, 1804x814) Thumbnail displayed, click image for full size. Leaves dying, what's happening?
Any ideas what causes this? It's almost exclusively the lower leaves doing this and some lowest small flowering branches nodding off or browning and dying but they are like 3 feet from the lights anyway.
The monsters are about 5 feet tall so obviously light penetration in the lowest levels is slim.

Been some 2 weeks in flower counting from first pistils.
Hydroponic, using bloom:micro in 2:1 ratio, EC around 1.3-1.5, but it keeps rising so I'm going down to 1 slowly. Doesn't seem to be nute burn though.
Using liquid silicon occasionally at 1 ml/litre. Sometimes adding hydrogen peroxide 1 ml/litre tops. Using top max 2-4 ml/l.
PH fluctuates approximately between 5.7-6.5 depending on adding new water etc.
Temps may be a little high but not super overkill. There is colder intake blowing under the canopy at almost ground level. Not sure if too cold.
>>
newgrowth2018 - Wed, 15 Aug 2018 09:33:05 EST 4RDjjsVj No.146258 Reply
>>146257
They might have windburn, or it could be the plant just putting more power into the buds and killing off the leaves that don't get as much light. The wind can gently rustle the leaves, but if any of them are waving around constantly or swaying hard it's probably windburn.
>>
newgrowth2018 - Wed, 15 Aug 2018 09:35:16 EST 4RDjjsVj No.146259 Reply
1534340116516.jpg -(159800B / 156.05KB, 1000x666) Thumbnail displayed, click image for full size.
>>146258
Two stages of PH imbalance damage, are you measuring PH?
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Rebecca Blatherlock - Wed, 15 Aug 2018 11:54:55 EST 5R5q7BKE No.146261 Reply
>>146257
looks like phosphorus deficiency.

Maybe your plant is so big it needs even more phosphorus.
But I am noob so you probably should disregard my guess work.

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