Species of the brown algae Dictoya are highly variable in size, shape and coloration. Some feature a brilliant blue iridescence, while others are more olive brown, such as Dictoya cervicornis. (pictured below) They’re fast growers that are abundant in the shallow reef flats as well as deeper coral reefs. The blades are flat and thin and often form entangled clumps attached to rocks, shells and hard bottom habitat. All varieties are very delicate, tear easily and can often clog pumps and filters. When introduced to the aquarium, many species are highly invasive and can be a nuisance, especially in reef aquaria.
Scientific Name: Dictoya Sp.
Common Name: Iridescent Algae
Origin: Worldwide Distribution
Depth Collected: 3 – 50 feet
Maximum Height : 12″
Growth Rate: Moderate
Light: Moderate to High
Temperature: 72-86
Propagation: Fragmentation, Sporulation
Difficulty: Moderate
Food Value: Somewhat Palatable
Nutrient Uptake: Good
Flow Rate: Moderate to High