First of all, the red looks like a young female to me.

Second of all (and I do soil) if that was my plant I would transplant. There is a deficiency or multiple deficiencies. I don't do the hydro, so the numbers mean nothing to me except I don't like the 6.0 PH, I would prefer 6.5, but......

Possibly Iron, K, MG, or MN missing. Probably needs N. Again, I am basing my statements on soil farming. Did you post in the hydro section?