flys in colonies

Remove the food that the fruit flies are after, for a couple of days. Don't leave moist food or fruits for longer than overnight. Sometimes, I make a trap with something even more appealing than the food that the flies are drawn to, after the trap has many flies inside, I put a cloth over it and bring it outside. I will do this several times a day, and it is pretty effective for me. I keep mantids and will put one in the trap, the mantid won't eat nearly enough flies but at least they can have a good time while I trap the flies. :P

 
Regardless the best way to deal with either of them is to let the colony dry out for a few days and remove all moist foods. Make sure there are no dead roaches either. At the very worst, remove the roaches and change the substrate.

 
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Maybe they're carrion flies. You need to remove the dead roaches. You can also put flypaper near your bins or enclosures.

 
Thanks they are fruit flies as the occasional carrion fly tries my turtle nest site I used to breed flies for my mantids& mantellas (which I don’t have right now). I'm going to let it dry out.

 
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