CROWN LEAVES

This might be a feed issue, so a flush is recommended. It can also be caused by mites. You need a loop to see some mite species.

i agree with timbarin it looks like ph problems check the runn off. i always do a 2 or 3 liter straight water feed 10 min before my nute feed to help keep soil ppm and ph under control maybe try the same thing its not like you have anything to lose

Agree with all above. Have only ever experienced this when the pH at the root zone is off. Check your run off then flush accordingly.

Hi i think RQS does have good genetics ( check my diary) and i think this is ph deficiency you say it's 6 in the stats but please check the runoff and then know for reals whats up. also i see that you are using advanced nutrients (Non biological) with RQS (Bio food) this might be an issue as the non bio stuff will kill the microbes in the bio dirt.

Rqs have not so good genetics, in soil ph is very very difficult to change and have problems with. Raise a little the light to avoid the leaf to curl and add some calmag to get the best photosintesis u can have. Hope to help and that u can understand me ✌️🏽💪🏼

Looks like your ph may be off. I would check the runoff ph and also check your ec. Ph out then fix that. If your ec is really or low then remedy that. Get everything in proper levels for your grow and the leaves will improve and buds will thrive. Cheers