I do aero and aero/fog, with great results.

As Tiny pointed out, it could be just stained from nutes or additives.

I would not use H2O2, hydrogen peroxide, not because of "beneifcal bacteria", which is not needed in aero or aero/fog but because it is not compatible with some nutrient lines.

Look for a product that is chloramine based, it has all the pathogen killing power of hydrogen peroxide, but is much safer for the plant and won't screw with the nutrients.

Dutch Master's product called "Zone" is such a product.

OM
oldmac Reviewed by oldmac on . Need help not sure what is happening -------------------------------------------------------------------------------- 1. Are you growing from seed or clones? clones 2. How old are your plants? 20 days 3. How tall are your plants? 16" 4. What type of hydro system are you using? aro sprayers 5. What brand/type of nutrients are you using?fox farm line 6. What is the Ph of your nutrient solution?5.8 7. What is the PPM/EC of your tap water? 0 8. What is the PPM/EC of your nutrient solution?900 Rating: 5