last month I had a 5'' crenicichla sp. xinguII (orange pike) jump tank from a quarantine tank (ich outbreak). It was still barely alive when I found it but I said f*** it and went ahead and flushed it. My silver aro jumped twice last week when doing a major cleanup and substrate change. No harm done. Hell Ive even had a discus jump tank at my ex-girlfriends. Also a few peacock eels.