I'd leave it alone.I am currently growing with the autoflower nutes from NLS. NEVER again! I started phing my water to 6.5. I flushed my containers and started to ph my water to 6.5 with some cal-mag. The yellowing and rust spots seemed to slow up, but it's starting to happen again :-/ Such a bummer. I wonder if top dressing this stuff would of worked better? I'm afraid to even try on my next grow.