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Is it possible to get a freshwater Black Molly, QT it and then acclimated it to saltwater and the salinity of the DT? Then put is in the DT to see if there is anything ill disease lurking in the DT? Reason why the Molly because it can be acclimated to saltwater and it's cheap.
https://www.reef2reef.com/threads/fallow-periods-going-fishless.190324/page-2#post-2855190