hello fellow blades, thank you in advance for any advice. 1st q: bubbles do not need to be hitting the roots, right? the water just needs to be oxygenated? My current setup has the air stones basically on the edges of the resevoir and the bubbles do not travel very far, but the entire water line has a 'ripple' effect at least. 2nd q: do i need to pour water from my res on the grow medium to flush anything out that the roots could be excreeting into it? i stopped 'watering' them as soon as i dropped the water level and roots grew out into the bottom of the res.