help r my ladies ok pics included

help 4th wk flowering 12/12 soil nutes ionic bloom/boost as per instructions thought it was because i forgot to turn my extractor to 24/0 and had it on 12/12 but as u can see still happening yellow leaves with black no bugs in grow room any ideas ph 6.5

Looks fine. They will eat the nutes out of the leaves during flower.

If the yellowing is bad you could hit them with some N. But if it is just some of the lower leaves I would relax. Sounds like normal flowering

yep, all apart of the flowering process.

Yeah that natural dude, grows looking great! +rep

thanx for yr comments one relieved mummy 1st grow leaves didnt have black bits on them