That my be the trick, having a good environment for dartfrogs and cp's.My lids are basically 2 peices of glass and you can't really prevent fruit flie escapees 100%.I use the 2 peices so I have one as a lid and one where the lights sit.Most plants that like 80-100% humidity all the time grow all too well,I want to get some nepenthes to try when weather is better for shipping.What I have done is add some fruit like orange wedges.But basically I only feed enough so that most of the flies get ate.I have melonogaster fruit flies that have wings but are called "glider" which means they can't really fly but can glide so if they are crawling and you try to kill them they mainly just hop.