I was trying to think up a way to separate them into tiny cups without having to do manual water changes on that many little things AND keep the oxygenation levels up AND keep them heated.
What about taking a large, long, shallow storage bin (like an underbed storage box) and line it with small plastic cups. Fill all the cups to the brim with the saltwater, and fill the bin they are in with several inches of water so the cups are almost but not completely submerged.
Overtop the cups run tubing (airline or aquarium tubing, sold at hardware stores) with at least one tiny hole punched into the tube directly over each cup. Hook the tubing up to a very small and slow filter that sits inside the bin.
The water will flow from the bin into the cups, spill slowly over the edge of the cup, and get returned to the bin. If the water flow is kept slow enough then the megalopa wouldn't be able to get over the rim of the cup. You could put an additional bubbler for oxygenation and a heater in the bin near the filter. Water changes could be performed on the bin rather than the cups. The speed of flow into the cups could be controlled by the size or amount of holes that go into the cups. Depending on the size of the bin and the cups, you could have several dozen individual grow-out bowls.
When it's time for land, add cups of substrate between the cups of water, and connect with strips of something climable.
(Working theory anyway.... Since it seems that the hardest part of all of this is keeping them from eating each other! Trying to figure out an easy way of doing this for next month.
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