Deficiency in Hygrophila Difformis
I would like to ask for some help in ID'ing a deficiency, I have searched and can't find the answer. My wisteria has developed veins that are quite yellow, it is quite a contrast from the color of the leaf. The leaves are slightly cupped at their edges as well. Nothing else is really showing any signs of deficiency.
I am dosing KNO3, Fleet, and traces as per the EI; must admit I have been a bit slack at testing N and P lately, but last week they were acceptable (15 and 2 at weeks end, respectively). CO2 is kept close to 30 ppm. Lighting is a little over 3 wpg. Tank is about 3 months old. Crushed coral in the filter. I am not dosing any Mg (or K over and above that present in KNO3) at present. Any thoughts?