Peat is molding?
I made a soiless mix using grit (2), akadama (1), perlite (1), and peat (1); and planted some tatsoi seedlings in an 8 cm cup that has plently of holes at the bottom. They are under 2x39W T5HO tubes with a fan blowing at all times. The temperature is 76-78F, relative humidity is 40%. I water every 2nd day; usually the top layer of the soiless mix appeared dried before I add water. Yesterday I noticed some white mold developing, mainly on the peat, but I also see those hairly, web like mold on the akadama and grit as well if I look closely.
I searched this forum for the keywood "mold" and realized most type of mold won't do harm to the plant, and I had probably watered too much which leads to molding. However I had a fan running at all times, air circulation is extremely well, and I only watered every 2 days with just enough water to come out at the bottom. I wondered if there are any other factors that could lead to molding. Our tap water is PH 8.4, so I added a bit of white vinegar to lower the PH to 6.2. Can vinegar contribute to mold? Eventhough a bit of mold is probably fine, but I'd still like to get rid of, or prevent it if possible. Would microwaving the peat before use be any good? How about replacing the peat with coir? I heard coir suppresses mold.
Here is my Tatsoi seedling, note the white powder like mold on the peat: