Leafs

It looks like you have a cal mag issue as well as they are hungry . But you need to know what your soil ph is at . If the ph is below 5.8 or above 7 the plants will lock out . So you will have to get some run off and check the ph of the soil. Also make sure your ph pen is calibrated . If you have anymore questions shoot me a dm

Yes, too much nitrogen. Also a deficiency of trace elements, which can be easily fixed with a dose or two of soluble trace elements available from any garden centre.

Puede ser un exeso de K, haz un lavado con ph ajustado y mide la escorrentia, ph y ec para saber los valores que contiene el sustrato

I'm not an expert mate but from I've seen around and read it looks to me like nute burn