Propagation: Moss/Fungus/Something on my soil, 1 by lancestorm

lancestorm wrote:
The 3 flats of Vinca are growing very strong. But I'm a bit concerned on the continued proliferation of this white mossy/fungus on the top of the soil. Can you identify and give a good way to treat? I was thinking of removing the top layer of soil with my fingers or spoon and then drenching the soil with a 1 tbsp 3% Hydrogen peroxide to 1 quart water combo. But maybe that is too mild of a solution. I've been bottom watering the seedlings with this combination of h202 + water since they were seeds, removing them from the water when the top of the soil started to become moist. I don't know if drenching it with this combo from the top instead of bottom watering might make the difference?