Fungus gnats in beetle substrate

[Defalt]

been getting lots of these, nothing seems to stop them from entering. Is there anything I can do to get rid of them without harming my beetles?

 

[pannaking22]

You can kill them as you see them or let the top layer(s) of the substrate dry out a little bit since their larvae are really susceptible to lower humidity and they aren't mobile enough to burrow deep down into the substrate. Are your beetles adults or larvae?

 

[Defalt]

they're larvae, but come to think of it, it does seem like there is quite a bit of excess humidity in their containers, thanks for the help