Mollies are a popular brackish fish species that are often kept in aquariums. They are known for their attractive appearance and easy-to-maintain nature, which make them a great choice for both novice and experienced aquarists. Because they are brackish they can survive in saltwater tanks, and actually thrive. They are voracious algea eaters and will pick your tank clean in no time. They are very easy going fish and get along with all other fish. They are live breeders so a few mollies can create live food for your tank for years, they are prolific breeders. Another benefit is that they do not have any natural resistance to the common tank parasites, like ich or velvet. So a mollie will be the first with symptoms giving you time to treat your tank. No tank should be without a saltwater molly. They are reef safe.