One of my Cattleyas is showing CA/Mg deficiency in semi hydro. The plant is otherwise fine with decent root growth (not as good as some of my others). However I have noticed that the new growths are gradually turning black. It's not bacterial rot as far as I can see
Reading on this forum it looks like its Ca/Mg deficiency. I use RO water and Dynagro which has 2% Ca and 0.5% Mg to feed. Should I add a supplement like
Amazon.com : General Hydroponics CALiMAGic Quart : Garden & Outdoor
and incorporate it in to my feeding schedule? Should I do it for all my plants?
How do you guys supplement Ca/Mg in semihydro?