Pale color usually means it needs nitrogen. It could be the ph too. For soil it should be 6.0-6.8 and 5.2-5.8 for hydro. If the ph is off it cant take up nutes like its supposed to. I dont think the rhizotonic is the problem. The recomended NPK for pot in veg is 10-10-10 and 10-30-20 for flower...