Flies in tomato pots

After the first batch did not show at all, I sowed another 10 Crimson Crush seeds after first chitting them, and now they are coming up. I have some other blight-resistant tomatoes doing really well so far. They are all up in the attic with a sheet of silver paper behind them. Every time I spray them with water I notice some tiny insects flying up. Any idea what they are please? Are they innocuous? Do I need to try and get rid of them?

Anton

Thanks Phil.

Anton

Use a fan I had that the other year with the peppers tons and aubergines in my grow tent damaged all plants so they were more or less useless di everything you can or they will batter them a fan will help a lot