10 days into flowering and dont know whats happening

ok I thought that I might have a mg issue so I added 1 tsp of calmag per gallon yesterday and now it seem like the plant is getting worse. It only effects the bigger fan leaves. How do you guys think I can solve this issue.

I always water with RO water with ph 6.0-6.2. I tested the soil ph today and it is 7.2.

What can I do?

looks like ur burning the fuk outta dat plan man. give it plain water and flush it out