What is a white stringy looking tail coming out of your black molly fish?

Your molly fish may have a fungal infection. Molly fish are susceptible to a number of diseases, including fungal infections, which can cause white, stringy tails.

What to do:

- Move your molly fish to a quarantine tank. This will help prevent the infection from spreading to other fish in your aquarium.

- Treat your fish with a commercial anti-fungal medication. Follow the instructions on the medication label carefully.

- Keep the water in the quarantine tank clean and at a temperature of 78-80 degrees Fahrenheit.

- Provide your fish with a healthy diet. This will help boost its immune system and help it fight off the infection.

If your fish does not improve after a few days of treatment, you should consult a veterinarian.

Here are some additional tips for preventing fungal infections in your fish:

- Keep the water in your aquarium clean and free of debris.

- Avoid overcrowding your aquarium.

- Quarantine any new fish before adding them to your main aquarium.

- Feed your fish a healthy diet.

- Avoid using medications that can suppress your fish's immune system.