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« on: October 15, 2017, 10:02:45 PM »
I use a two level FN-182. I have two chins, one per level. I originally wanted to combine them but they turned out to be incompatible. It turns out the space they have is just fine for them so I wouldn't be too critical of the space you have. They are thriving in their areas.
It's better to not switch them around for variety. Chinchillas like their space and are territorial about it. That practice may be contributing to your urine problem.
I recommend adding shelving to the cage as well as wooden or metal splash guards. This can also help and it gives your chins more space. Shelves should be wood, preferably white pine or aspen. The wood can be cut with a basic hand saw. Fasteners such as stud bolts, wingnuts, and fender washers can be easily installed with a drill and bit.
You can certainly swap the wheel back and forth with little effort. I have a chin spin as well and it's easy to set up.
My advice is keep the setup you have and save up for another wheel. Make the modifications described and you should be all set.