It's quite a light green and some of the leaves are showing damage/poor health as per the pics. Under feeding? Though some of the tips of the leaves show what I thought was nute burn.
you have a ph issue. in turn is causing the plant to lock out the nutrients it nees, so flush your plant until you have a run off of 6.0 ph reading.
next let the pot dry out for a few days. when you start feeding nutrients again add cal mag and feed the plant at half of what you have been giving for the first few feeds, you should see improvement in a week or so
I read you give 3l of water per plant almost every day. This is a lot. Maybe they cant breath, becouse is too much water, than they lock. I have the same problem with 1.25l of water. I have 19l pot. When you water, water slow with breaks inbetween