A healthy rhizosphere requires dissolved oxygen (O2) as well as moisture (H2O). Water is not able to hold as much oxygen as the air, so roots can consume the available oxygen in the water to the point where roots start to ‘suffocate’ pretty quick. There is really no such thing as over-watering. Roots can live submerged as long as O2 levels are sufficient. In comparison, CO2 is about 200 times more soluble than oxygen. As long as oxygen levels are high, you can water coco damn near as often as you like. But know this, plants uptake far more water than minerals so if your EC/PPM is too high, over time salts will form during the dry back periods creating an acidic media. When it comes to feeding, more often should have a lower PPM than less often when PPM can be a bit higher. A nuclear dose of oxygen free radicals will kill life in a soil (like microbes, fungus gnat eggs/larvae, etc.), but lower doses can add oxygen without harming microbes. A 3 or 4:1 ratio of water to 3% H2O2 can kill microbes and some pests. 2-3 teaspoons per gallon of 3% hydrogen peroxide will not harm microbes while adding extra oxygen to your media. This is how you’d water/feed a media like coco more often. Plenty of growers supplement CO2 for their leaves and ignore the O2 boost roots love.