What do you think those flys are fungus gnats? I was using Roots organic original soil loved the soil but every bag I had bought was loaded with fungus gnats. I won't buy any soil that has holes in their bags or that contains any beneficial microbes or mycorrhizae which they feed on. I've been mixing my own the adding my own microbes. If they show up it is usually once you start adding more water to the tops of the pots. Past 2 grows I used Mosquito bits, diatomaceous earth and a 1 inch layer of Gnat Nix to the tops of the pots seems to work out well by drying out quicker than the soil.That with sticky yellow traps kept them at bay no major issues.👍
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