New Transplant

We just transplanted a new batch of clones into 6x6 rockwool cubes, with an ebb and flow system. After three days of 18/6 light schedule our plants are turning a little yellow on the leaves. We have a slightly high pH of 7.0, 300 ppm of nutes, and watering once daily. First off is there anything to worry about? Second off if there is what should we adjust? Our daytime temp is around 70 and at night 62. We are using some nutrients that are "self adjusting", called supernatural. Could the high pH be caused by the rockwool? we rinsed them well before using them.

At 300ppm, it sounds as if your plants have a nitrogen deficiency. Bump it to 600ppm and watch.

So we bumped up our level to 600 and flooded today. We kept everything else the same, about how long till we should see some improvement?