Milkweed bug barrier question

rugburn

Ootheca
Hopefully I'm posting this in the correct forum, it just seemed so much more applicable here than in other inverts. Anyway I'm thinking about getting a milkweed bug colony going. I saw an article saying to use a Vaseline border, but not if there are juvies in there. So any thoughts on how to keep these guys in short of putting a piece of fabric over the tank/enclosure? thanks -Ben

 
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