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I have an upwards migration worm composting bin that currently has three trays. In recent months, I had done a poor job ensuring that the moisture level in the top bin was reasonable, and it got out of control and got pretty wet for a while. The worms did not seem to like this.

After several weeks I was able to get the moisture under control. However, the majority of the worms are now in the bottom tray which is mostly already composted material. I don't imagine that there is a whole lot of food/resources in that bottom tray, so they must have been pretty unhappy to move down there and stay there. I also note the middle tray is pretty empty of worms as well.

Is there a good way to encourage the worms to leave the bottom tray and move back up to the top tray where the new food is?

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nice interesting question. Some of them might be able to be reintroduced to the upper & middle trays manually, and then exchange some of the soil at the same time. Once theyre a bit reestablished they may begin moving around again more. The temperature or something might be more to their liking there too, so maybe check that also.

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