Yellowing leaves from bottom up can indicate a nitrogen deficiency. Looks like you are feeding a root stimulator and then bloom nutes. Iām not sure it will have high nitrogen content. But I would always test the soil ph before deciding how to progress. Bad ph can look Like different nutes deficiencies, because it locks out different nutrients, depending on the ph level you are at. I found that over using a root stimulatorās beyond the first few weeks set me up with high ph last grow.