Sailfin Gold Molly (Pair)Mollies are one of the most beloved community tropical fish. Our Sailfin Mollies are hardy and serve a strong purpose in our planted aquariums for their algae eating activity. Fish Size Guide: The 'Maximum Size' outlined below is the length this fish can reach as a full grown adult. For the actual size please use the select menu above. Discus. ae prefers younger stock for their better ability to adapt to new water parameters and higher tolerance