Hello, ive been running an ebb and flow bucket system. Ive noticed my skywalkers yellowing on the upper portion of the plants. My other 2 strains look healthy. When I pulled the buckets to look at the roots on the skywalkers they seem to be a brownish color. All the others have a tannish color. It seems like it may be spreading towards the front of the system. Im using House and Gardens full line, week 3 of veg. 40 gal in res. res Temps range from 66-72. currently 1 airstone. Ill get some pictures up tonight of the roots and plants.