Calcium/Mag deficiencies usually show up during veg.. kinda surprised to see it at this point.
Did you ever go all the way up to 4ml/liter on the AN nutes?
My story with advanced nutes is funky
I ran them for years no problems.
Then i started getting weird deficiencies the last grow.
I thought it was because my sprayer went down but now im thinking my nutes went bad?
I will be fair and honest in saying i dont think there is anything wrong with advanced nutes except the price
Because i fully admit to not storing the bottles properly and they where subjected to temp extremes because i shut my grow down for about a year so i stuck it in an outdoor shed for storage lol
But anyways i got the same wierd deficiency this time and cal mag did not help so i shit canned the rest of my an bottles.(they will feed flowers in the ditch this summer)
Another HUGE pet peeve of an is that it stains roots. For the last 7 years i have had off white roots.
So i wanted a high quality food grade nutrients that are clear.
Im testing chem gro 4-20 and so far it is excellent