Rando clone war

Just starting week 7 of flower. Well the two plants in the back have been struggling for the last week and half and are finally just starting to get more green down the middle of the leaves . Buds are really starting to swell all the way down the stalks and continue to grow taller . Did a ph check on the soils and they are all between 6.2 and 6.5 . The 2 back plants are taking longer to drink then the front so the water schedule is about to change . Need to dry out the 2 back plants a couple times between feedings just to make sure I dont get root rot . The 2 plants in the back are also bigger then the two front .