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Ph fluctuation can cause the roots to lock out and stop taking up nutes. Remember ph is big changes between numbers and a changing Ph is stress for the roots.

sure looks like magnesium deficiency to me. Up your pH to 6.2 and watch your girl come bouncing back like a beautiful set of 19 year old female DD's!

Thanks @ Mrs_Larimar @Roberts @DeepWaterGrower @AsNoriu I will leave open this question until it’s solved. Thanks for everyone the detailed informations . Much appreciated.🙏💨🌱

Yes ph swings will cause this especially when it goes above 6.2. Point 1 is a big change for the plant. When I get my nutrition level right with what the plant wants the ph will not change much day to day.

Your light is to Strong/ to Close. Its easy to See in the way the Plant grows Rise the light or DIMM back.new leaves should Look good

Hey buddy as AsNoriu said looks mag def. Cal and Mag are better absorberd at higher ph, I would try around 6. Moreover some strains prefer a 6-6.5 range (don't understand why but I saw some hydro diaries with ph locked at 6.5 with amazing results). So, since you're already using 1.5 ml/l calmag I wouldn't add more. Just try to fix ph to 6 and look how she reacts. Overall plant looks very nice