Hey everyone... I'm in need of a little advise. I have a teeny toadlet (see pic to left) and he is thriving and doing well. However, I have a flightless fruit fly culture in the tank with him and they seem to be getting out of the darn thing somehow. I open it and let a few out (I don't want the tank crawling with 100s of them) and every now and then, I find one or two on the outside of the tank.

I have a screen lid, which I've covered with both tulle and some nylons... how the heck are they still escaping? LOL

Any help is appreciated