I once tried moving a canary wrasse from a 50gal into a 20gal for a few weeks so that it might clean up the flatworm problem in there. It did not like the small tank one bit. It hid most of the time and when it was out it just swam in a tight circle. When I moved it back to the larger tank it was out swimming freely all of the time once again. Obviously they are not the same fish but it could be the same problem.
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