Replying to get this on topic again
I am using the MSU ro feed @75 ppm N @ every watering with Humate added every two weeks .I also use KLN on poorly rooted plants & superthrive when i feel like it .The superthrive i will probably stop using once i run out but i do love the smell so i am hooked on it not the orchids
I am getting some yellowing leaves with green in the middle section ,but look at the roots which are doing great so am not putting it down to a feeding problem .
I am growing in CHC ,and aim for a ph of 6.0-6.2.
I sometimes give them a shot of epsom salts and love to foliar which i do most days.
Obviously more tweaking will be done .