BCN Power Plant Auto run

So this week we have seen some more stretch, the critical xxl currently stands from soil to canopy at 35 inch, power plant 2 (the original runt) stands at 30 inch and power plant 1 stands at 21 inch. I have done some more defoliation to the lower part of the plants, buds seem to be stacking nicely although I noticed some yellowing of leaves on the power plant 1 (see photos), I'm presuming this is a phosphorus issue which will hopefully sort itself out with the bloom and bloom 2 from living soils, which is going to be applied in the next few days and maybe a little boost of biobizz bloom while the organic material breaks down, apart from that the girls have had their once a week treat of ecothrive biosys at 1g per litre.