I'm just finishing up my first grow using GH nutes 0-5-10 G-M-B the whole grow. I always top off with full strength nutes. For the veg of the grow I did a res change every 6-7days. Since flower ( about 4 weeks) I have not done a res change yet. The pics were taken last week--the buds are filling in nicely! Oh, the only other thing I have added was Liquid Karma during flower, ~5ml/gal.