Do you have any 'wildlife' in this tank?
What about those yellow sticky paper traps used for bugs?
The only other fix I see for terrarium or paludarium is to add a fan to increase air flow.
There was also a fungus gnat mite that you can buy to add to the soil but you would have to see if it would harm the other 'bugs' you want to keep.
Sorry if you've already thought of these solutions.
I figured someone would ask... but didn't want to make the original post too lengthy.
Great idea on the mites BTW. I thought I read about them somewhere. Any experience with these?
I currently have Harvester Ants (no queen), and a Fire Ant Queen. As well as a Spiny Flower Mantis (These guys are dope!)
I want to make sure that these can survive... but seems like any information has more 'marketing' that pure fact.
I do have a fan on the tank. The fan combined with not water, did AMAZING results on thinning out the gnats. Until I started watering again (keep the plants healthy).
I imagine that if I did several cycles of watering (to hatch the gnat eggs), then dry spell (to kill the larvae before they turn into adults)... it would do the trick. That is getting toucher though now that I am trying to grow plants. and I am growing impatient at looking at a desert tank.
Fly paper works killing adults.... but for months they just keep coming. Now that I have a mantis, I'm trying to stay away from the paper as much as I can. PS. slugs are immune to fly paper, and they apparently LOVE eating stuck gnats.
I also find that I do not believe the adults 'eat'. No bait I've used seems to attract them at all, they only seem to fly into the paper, or water by shear coincidence.
Phwew, hope that helps