I kept freshwater for many years, before starting salt.
I had a 32" South American Gar and an 18" Tiger Shovelnose cat. When I switched to salt, I donated both to the Shedd Aquarium, where I still see them, on a monthly basis (sometimes more), when I go.
I did keep one freshwater tank, that contained a 12 year old Arrowhead Puffer, who just recently passed away from old age.