i would just do a ebb and flow or dripper, when the fog is off to soak the roots, or u could set a timer to fog, and then right after u can have another timer switch on a drip or something. So ur cycling the process, when the roots start to dry up let the cycle restart, the roots will absorb a lot from the fog, and then they will get drenched right after with the a drip or ebb or even ur misters. This should keep everything in check, and allow u to still utilize the full capability of the fog. That article i gave you is pretty good, u dont have to follow anything to the T, make it ur own:jointsmile:
About the roots being in the bottom, is it possible to have a separate res? I don't think u want the roots to be submerged for long periods of time. That tap root sucks up a lot of nutes, it might overwhelm the fog capabilities.