These plants are in 5 gal pots using Botanicare's Ready gro media and hydro nutes with a bunch of Botanicare (Karma, Sweet, Silica Blast, Cal-Mag) supplements. PH is about 6.2-6.3. Room is always in the mid 70's and CO2 enriched. Each pot is hand watered with a wand as needed. I have had some powdery mildew and sprayed with Serenade twice. I can't see any bugs with magnifiers and want to know what is wrong. Any suggestions?