I have a grow of CHURCH and CHEESE some growing in coco with drippers and some perlite,some more in soil and perlite they have been in flower for four weeks 70% of them are fine but on one tray where they are growing in perlite and one of soil perlite mix the buds have gone a yellow colour and seem slightly stunted i have tried leaching the substrate on each but to no avail, any ideas anyone thanx Devious D