I have always looked for a rearing tank that separates the young from their mother like this one. There were no cracks in my brood box, but the brood catching part only stayed in place thanks to the elastic band. I think the mounts (the medal you bend) should be replaced with suction cups as the grow box tends to drift away with the air being pushed inside. After a few adjustments, the box does what it is supposed to do.
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