I have a green crack plant almost done w week 4 of flower and the older leaves are really starting to turn yellow. I know its common for the leaves to fade in flower but this is my first time growing so I wanted to check with the experts. It’s in a 7gal fabric pot w FFOF soil and I feed FF trio nutes at half strength about every 3-4 days with occasional plain ph water feedings. Runoff pH has been between 6.0-7.1 during flower and ppm has ranged from 1750-2900. The new sugar leaves are pretty dark green, is there something wrong or is this yellowing fade normal? Thanks!