actually most tropical fish will still do ok in your temperature range...but of coz not optimal.
Or you can look at some species that thrive in coldwater.
THey are sold in local temperature water, so anything lower than that is not only acceptable , but preferred
Here is the one i will recommend.
It is the Red Shiner...i had seen in C328 a few times
a small fish that thrives in cool water.
the humpy growth on the forehead of some are natural.
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