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What is a Molly Miller?

By J.L. Drede
Updated Jun 04, 2024
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A molly miller is a type of fish found in the Gulf of Mexico, along the southern Mediterranean, and the Pacific around Japan and Taiwan. Its scientific name is Scartella cristala, and it is part of the Blennidae family of fish. Like many other fish in that family, it is sometimes called a combtooth blenny. It is usually brown or olive in color with white and black areas covering its body and fins. The notable features of the fish tend to be its large eyes and the short hair-like appendages that cover its head — much like a mohawk haircut.

The molly miller is a tropical fish and it can be found in warm waters across the globe. It is a reef-associated fish and prefers shallow depths. The molly miller is rarely seen in depths below 32 feet (10 meters). Rocky areas and tide pools are common habitats for the fish, although it may also make beds of algae its home. In the wild, it is herbivorous and survives mostly on a diet of algae and other plant life. It is harmless to humans, and there is no market for the molly miller as a food fish. Commercial interest in the fish is limited to aquariums and fish stores.

Molly millers are somewhat popular for marine aquarium enthusiasts. Optimal conditions for a tank with a molly miller can be difficult to maintain however, so many aquarium experts recommend only experienced fish handlers attempt putting a molly miller in their tank. A tank for a molly miller should have plenty of hiding spots, including coral, rocks and thick plants. In aquariums the fish usually grows no larger than 4 inches (10 cm) in length, so a 30-gallon aquarium should be suitable. It makes a good fish for a community tank, but it should not be kept with other molly millers or fish that are similar in shape and size. It may view them as a threat and attack.

Both plant food and crushed crustaceans are suitable for its diet, although seaweed or algae should supplement it. Water temperature needs to be between 72 and 78 degrees Fahrenheit (22 to 25 Celsius), and the pH must be between 8.1 to 8.4. Assuming the tank conditions are suitable and the fish is comfortable, it will spend most of its time near the bottom of the tank, in areas with low to medium light.

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