Thanks for the updates. Sounds like you have a very nice selection of water lilies. You sparked my interest last year about native Australian bees. If I recall correctly, I remember reading something about
T. carbonaria placing a sticky mix of resin around their entrance.
I found it interesting that this resin acts as a deterrent to any predatory insects (enemies of the bee), and has antibacterial properties that clean pathogens & parasites from their feet as they enter.
Tracheal and Varroa mites are a huge problem over here with bee keepers. Varroa mites really screw with a hive because the females lay their eggs in brood cells (with developing larvae) just before the cell is capped. A lot of different "natural" ideas have been used at hive entrances to help reduce the mites, mainly to avoid having to use chemicals such as Apistan (e.g., entrance board reducers, screened boards, grease patties, crisco, etc.), but all are of limited value and not 100% effective. The only 'sure-fire' cure is by using mite-tolerant bee stock (such as VSH or Russian bees).
I like the eduction/induction concept you mentioned for splitting the hive. Especially like the "viewing window" to see how the hive is progressing. Picture of
T. streptophylla below (fully hydrated). After about a week without water it gets very tight and curly, almost like a small symmetrical ball.