Clean out all your cages and put in fresh new substrate (quite a pain with cockroaches, I know) and tape or glue some fine netting (old net curtains or a cut up pair of ladies tights) over ALL of the air holes in the cages to stop flies getting back in.
The main reason for getting these is a build up of waste in the cages, most likely the cockroachs, particularly if you have no substrate in the bottom. You have to clean them out a lot more when you have no floor covering in my experience. Could also be the snails : make sure you take out any rinds and the tough bits of fruits which the snails will leave behind.
As far as the roaches: try to let the cage dry out, and remove old food. Try to feed the stick insects and snails something that is leafy and not mushy. The fruit flies don't like leafy veggies. (At least not fresh ones.)
Are you feeding your roaches fruit? I've found that some types of fruit esp. in the summer time will generate fruit flies on their own (larval stage already in the fruit).
The only way I've found to get rid of them is to replace the substrate (or remove the substrate, bake it for a good half hour @ 350 degrees, and reuse). I've tried letting the substrate dry out, and that hasn't worked. If you dig through the dirt, you'll find little wormlike fly larvae (sort of looks like millipede babies, but translucent)...this is the real problem.
Even if you remove leftover waste from the cages, the flies can still be attraced by the high humidity and wet soil, as it makes an ideal spawning ground. So go with the netting method suggested by Ecilious, after replacing the substrate.
Oranges are worst. I hang fly paper above the tank. It works very well. So does the flat paper on the inside of the tank. as long as your roaches aren't climbers.
The farm stores sell a bell like catcher, filled with fly phermone. stinks but catches all the flies and fruit flies.
Fruit flies aren't worse. I hate Sciaridae flies (maybe you've got them in your terrariums?). They can develope everywhere where is highier humidity and any kind of organic matter (even in flowerpots).
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