sir_isOanswered grow question 4 years ago The colour differences and especially the browning on the edges there makes me think you have mostly potassium and phosphorus related issues.
Potentially excess nutes/pH imbalance causing lockout, or deficiency of potassium, especially. If I had to guess. Along with that, potentially excessive phosphorus.
Lay off your nutes for a while (or at least lower it significantly) and reassess. Though I would recommend a bit of potassium.
Good luck.