i only got to see the dead gecko
when it was dissected found 2 maggots then the guy told me the story
about 20 yrs ago
never had a problem myself though
reported to me a few years back
lizard ate the fly, when it popped in mouth eggs stuck to skin on head maggots hatched out and climbed into nostril and ear cavity
person couldn't believe what they saw
while it is small it will hit the lid and drop back into the water
when they are big acrylic sheets are the best
i have seen them break 8mm lids to try and get a moth on the light