Hiya NS! Glad to se things looking good around the grow and seeds making - +800 seeds is a super haul
I had fungus gnats bad last season, inside and outside in the end, and it took a long time to finally be rid of them. I used all the methods including blowing a fan at the soil - and I still had em (I think the PeatMoss I bought was infested with eggs actually). By far the best and most effective solution was Gnat Nix. It’s like perlite but a bit rougher, and t goes on top of the medium surface and stops them getting in to lay, and stops any larvae from getting out. I ended up putting some in the tray as well and making sure the lower holes of the pot were buried in it... becasue those li’l fookers will get in through any gap they can find! Basically you want to stop their pathway to the soil, or whatever medium is in the pot. Gnat Nix is made by Growstone i think, and I can’t recommend it more highly.
This weekend is looking good ... I’ll msg you!