<span class="link_user">@Dewdyo</span>, thank you, I think I had that problem in my last crop. I checked now that my tap water is very soft, so I got some Calmag solution to fix the EC to 0.4 before adding nutrients.
@@vapedboy, No problem mate. I'm glad you found the fix that work for you. Since I grow fully organic. I use mineral water with high Mg content (you can find that in almost any groceries store) when i see deficiency.
@@vapedboy, I'm sorry for late reply, but Mg deficiency is visible with discoloration and yellowing between veins on leaves, followed by small brown patches.