H2O2
One thing you could do is add half a cup of regular Hydrogen Peroxide to one gallon of water.
This adds oxygen to the roots and also staves damping off and in warm weather, fruit flies.
I prefer to put some of this H2O2 water in a tray and then set my seed trays in and let them absorb water from the bottom. Then I remove that tray until the next day.
I also drain over watered plants and then add some H2O2. Have saved other drowning plants this way too.
Sidney
