After a split tank, the tank is supposed to be pretty much empty except for water bottles, scattered food, and nesting material, and then you build it up gradually. Last night I gave the gerbils sand baths. Peanut was very excited once she had figured out how to roll in it, and she ended rolling around dozens of times!
Today I gave them houses, and moved the nests they had built into the houses. Both pairs had been nesting under the water bottles previously so the bedding kept getting wet. I came back a couple of hours later to find that Twiglet had moved the entire nest back to its original spot. I guess that's me told!
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