good evening guys what can this be? Thank you very...

and what do you suggest I do?

You have nitrogen tox going—-

last week i put cal-mag

Puede que sea una deficiencia de hierro si no me equivoco , pero es super leve . Que tal las dosis con microelementos ? ..saludooos ! Recuerda la T del agua de riego

To me it looks like the beginning of an iron deficiency. A dose or two of a soluble trace element fertilizer available from any garden store, should fix this quite quickly and boost your plants health at the same time. Cheers, Organoman.