All fresh water...I got into keeping bigger fish. Had some indo dats, peacock bass, tiger shovelnose catfish, marble motoro rays were all in the big tank. Then various geos, chocolate cichlids, lima shovelnose catfish, sun catfish, etc in the smaller tanks. We also have a giant koi pond. The new house has a pond, so the koi are moving. Selling off everything else tho.