Pumping out side will work. might take a bit a electronics to keep the temp stable though. As for other fish: Gobiomorphus breviceps, Upland BullyGobiomorphus cotidianus, Common bullyGobiomorphus gobioides, Giant bullyGobiomorphus hubbsi, Bluegill bullyGobiomorphus huttoni, Redfin bullyCheimarrichthys fosteri, TorrentfishThe whitebaitmany of the non migratory Galaxiids (although most have very low numbers so not for keeping)