what have you been feeding them how often how long have they been in flower ?
The more info you can give better answer you’ll get hope someone can help
Bump you back up

I've been feeding them these here nutes in the photos below putting 3ml/L. When i water i water till it comes out the bottom of the bucket and i dunk the fabric one, i generally wait till they are super lite to water ill pick up the pots to see if they're dry.
They are 11 weeks old now, Northern Lights Autos, so say about 3-4 weeks in flower they're in just basic soil no pearlite.
Lights are
mars hydro 100w
ts600 two of them.
I started feeding once i saw they had begun to flower nothing before that. Thought the dirt would have enough nutes in it but i guess not. If its not fungal its nute problem and i haven't been able to catch up with it and get them green again. lmk what you think went wrong and what i should do different next time.
I'm also thinking about getting some manure to mix with the soil to get them to flower then start feeding next time of course. What's done is done just hope that i didn't screw up to much and the buds fatten up a bit lol.