Yes I did mean Mg lol my brain is spacey from this oil loldont you mean N and Mg ??? there is no calcium problem ... not with my tapwater lol
I just found this on another forum.and the reason why i doubt that it is Mg is because the purpling of my stems has been diminishing as in recovering ...
You may be running too low of a pH and locking it out;
"Hydro and Soil less Mediums
Magnesium gets locked out of Hydro and Soil less Mediums at ph levels of 2.0-5.7
Magnesium is absorbed best in Hydro and Soil less Mediums at ph levels of 5.8-9.1
(Wouldn't recommend having a ph over 6.5 in hydro and soil less mediums.) Best range for hydro and soil less mediums is 5.0 to 6.0. Anything out of the ranges listed will contribute to a Magnesium deficiency."