Fungus gnats

[Axqu]

The simple answer is to let everything dry out and I’d definitely toss the houseplant. You may have to change your substrate a few times as well and /or move your terrariums to another location in the house. I had a similar problem once and eventually they disappeared. I’ve also heard anecdotal evidence that springtails will outcompete them in a moist environment. So if you have decent springtail populations in your enclosures you may be at an advantage. BTW, which species and what size and types of enclosures are we talking about?

I have a 40B with a cane toad (Rhinella Marina) as well as 2 empty terrariums (10g, 20 long). I moved the empty terrariums to the very cold basement to dry out, and I replaced the substrate in the 40 with substrate that we baked in the oven at 400 degrees for 20 minutes. (Several small batches). I also plan to get a sundew (Drosera Capensis) to combat any future hitchhikers hopefully before they can get established. We're moving to Arkansas soon, which is a lot buggier than NJ. I think baking the new substrate fixed it though! We haven't had any gnats since!