How large could atmosphere-preserving balloon-organisms be on an alien moon?

Ceraon is a moon with advanced megafauna and flora. The moon is pretty small, so gravity is only about one fifth of that on earth.

Much of the life-preserving atmosphere is retained through a great number of sedentary organisms that form translucent biodome-esque "atmospheric balloons", allowing other life on Ceraon to flourish inside.

This planet's ecosystem, and the balloon-organisms, has just started being studied by earthling scientists, so detailed knowledge of "why"s and "how"s are still limited.

My question is, what is the largest size these atmosphere-preserving balloon-organisms could achieve, realistically? For instance, would one's the size of a football stadium be too unrealistic?

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How large could atmosphere-preserving balloon-organisms be on an alien moon?

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