does this look like Deficiency ?

Hello folks, first grow here, 3 autoflowers 2 NL by nirvana 1 cbd crack by fast buds, let's say all elements are ideal, Ph, humidity, n temp, n you still get fan leaves go yellow, even though I fed it Xtra mag, few times, could still be hungry for more? I don't know if it's because I gave it too much Xtra mag or too little it's so confusing, tell me what you think from the pictures plz, should I remove the yello , should I add more calmag?

What medium are these in and what have you fed besides cal mag? This is not calcium deficiency. For some reason only the top half of pictures show when I try to look but thumbs look more like potassium deficiency.

I feed them Advanced Nutrition Sansi Grow n Bloom, the one that didn't flower I feed it Grow still, and the other two Bloom since last feed 2 days ago, growing in peatmoss based soil made for seedlings, so it's light n mixed it with lots of perlite, the yellowing always at the bottom, those fan leaves I put them up, so when I water on LST they don't touch soil.

Do you use tapwater? Do you check and adjust your pH? No more cal mag. Excess calcium is a major cause of lockout.

hotrodharley said:

Do you use tapwater? Do you check and adjust your pH? No more cal mag. Excess calcium is a major cause of lockout.

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I use tapwater left in a barrel outside, n Sansi is PH perfect, so it's not a ph issue ‍, well I just fed them with grow/bloom n Xtra mag let's see what happens, I won't
feed them calmag again for sure.

My sense is maybe a slight def in N but its hard to tell (for me) from these pictures.