Insects: subtle Bubble Display problem number 2

One morning I came back to my prototype bubble display to find this:
dead fly trapped in bubble display fluid tube

Obviously my final bubble display will need to have a screened mesh at the tops of the tubes to allow air to escape, but keep insects out. (But I will also need a way to re-fill the tubes, so it can’t be a permanent screen…so acrylic welded solutions are not on the table….)

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