I use Diluted Milk for powdery mildew problems. From what I see you have over watered and caused a high humidity problem.
The water from the bottom up method works best. Place your pots into about a inch of water let them drink it up till you feel moisture with your finger at the top. Then pull the plants out of the water and "let the soil dry" when it has dried "not to dust" repeat the process.
Soon as your seeds sprout I take the heating mat off and the cover. Some leave the cover on longer but to each their own.
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