I seem to doubt it. I raise Koi and GF in mud ponds and there is a limit of salt which a GF or KOi can tolerate, and then its at a very short term. Its relatively low when compared to what a SW would be kept in even at the 1.020 level. NOw if it could very slowly be acclimated to a saltwater environment over a period of time its anyones guess but I sure do not see many folks experimenting to find out as there really is not any need. Mollys and such naturally over eons of time have migrated in and out of salt water andlive in brackish waters so its not a big surprise. There are a lot of FW catfish that will turn belly up with just a hint of salt in a tank, with a cory being very susceptible to salt induced deaths, just form folks adding common aquarium salts.