Hi guys!
My plants are 5 weeks old today. I already topped them in prep for my mainline technique. The ladies seemed to be growing well until 3 days ago. I began to notice small brown spots that look like small splashes of mud. I noticed the spots yesterday and 24 hours later I could tell they got bigger. Some leaves seem to have the brown coloration along the edges of the leaves. Each plant has four fan leaves on the lower nodes from where they were topped. They also don't seem to be as green as they were when they about 2 weeks old.
The new leaves at the top of the plants seem to be even less greener than the older leaves. I don't know if its a calcium or potassium deficiency. My run off PH has always been around 7.5. I flushed several time during this grow and kept feeding with PH 5.5 - 5.8 but it didn't change so I let it be since it didn't have any negative effect on the plants.
Any tips on how to reduce the PH of my root environment will be much appreciated. Please guys safe my plants.
Here are some pics of what the plants look like now and close ups on the leaves.
Week 5

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This one has always been they least developed since they were seedlings. It also seems to be the most affected by the brown spots.

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This one is the biggest of the 3 and seems to be least affected. But when you closely you can tell she affected too.

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This is the mid-sized one among the 3. Its affected too.

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