By the way, it's quite difficult to decide how much they differ in size, because they fly and run so fast. Probably the one I took the picture of, was one of the larger ones.I checked the link,and you're right....maybe yours are a different type of soil gnat?
Because the ones I get are little tiny things,like 1mm long or even a little less.
Or maybe the ones I've had are just sickly little buggers...
Thanks for the tip, Urban.edit* not saying if you have gnats or not, but if you did
I used sand to help get rid of my fungus gnats. Makes it a pain for the adults to get down to the soil. 2" worth. I did that, maybe a bit thicker, in 2 huge 32 gallon bins. That was some work. But worth it. Then I killed the fungus gnat larvae with a water / hydrogen peroxide solution. Watered twice I think with that.
Didn't have much of a problem after that. There were a few but...I had 200 litres of soil going. Could have been a nightmare.
I picked my sand up at Home Depot. kids playground sand or something. Also put a fan blowing over the sand. Adults hate that too.
And there was zero issue watering. made it easy. Filters right down. Slow water, you can see where it goes, it made my watering easier. But again...huge bins.
If I can't get sticky traps, I'll try to get rid of them with sand.