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Hello Dieter,

I kept, over the aquarium, a gauze with a very fine mesh. This way some fresh air came into the container. I kept the flies indoors at room temperature.
Beware, though. I raised the Myathropa from larvae. And when starting to pupate they migrate from whatever they need. Be that muck or a living bee, to a place where they deem ideal to pupate. And those full grown larvae can crawl through any seem, crack and crevasse. I found pupae across the entire room and the next room. And some I never found, except the living fly buzzing around the room some day.

Greetings,

Ectemnius