Cardinal..maybe your powerhead is causing too much disturbance last time which will in turn cause your CO2 to escape and hence saturation to the optimal point is not possible. Whereas for the plants bending towards the high lighted areas, seen in this forum regarding the dosing of K or potassium will change the growth behaviour of the plants...maybe that will be of some help but personally I don't bother with it..just trim to the way you want the plants to look. []
Plant Physiology by Taiz and Zeiger
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