Skunky Questions :)

i hate leaf rusting i never quite got rid of it but i think i know now its most likely iron diff

Light too close.

Hi. You used Plagron Royalmix and the organic Nutrition from RQS=?.... If yes… thats the reason why^^ The royal mix is aleady fertilised. The Organic nutrients you mix under the soil are a heavy stuff ( i use them too). One of These Options ( either the soilmix, or the nutes) would be enough for the Plant.Its hard to get a solotion here. Because the nutrients are mixed with the soil. So you can go with just plain water until the end of the grow // or at least the last weeks of bloom

I would personally try raising the pots off the cold floor and give a fush of 5.9 ph'ed water then let them dry up before you continue with the feed ✌️

@Germano that could be Iron related Mate You could try foliar spraying some chelated iron on the leaves and seeing if the problem persists