Over the Rainbow Rhodactis Mushroom

Over the Rainbow Rhodactis Mushroom, Rhodactis spp. and related species, is a striking corallimorph known for its fleshy oral disc, textured surface, and exceptional range of fluorescent colors. This specimen displays a turquoise to blue-green base covered with densely scattered raised vesicles in vivid red, orange, purple, burgundy, green, and yellow tones.

Rhodactis mushrooms are corallimorpharians and do not produce the hard calcium carbonate skeleton found in stony corals. Instead, they form broad, fleshy discs attached to rock or other hard surfaces by a basal foot. Their oral discs are commonly covered with numerous short, bubble-like or finger-like projections that create the heavily textured appearance characteristic of the genus.

The Over the Rainbow color morph is particularly dramatic because multiple contrasting pigments occur across the same mushroom. Bright red-orange vesicles are interspersed with purple, green, and muted burgundy areas across a blue-green background, creating a highly varied multicolor pattern. Under blue-rich reef aquarium lighting, these pigments can display strong fluorescence and pronounced color separation.

Rhodactis mushrooms contain symbiotic photosynthetic dinoflagellates that provide much of their nutritional energy. Their textured oral surfaces can also capture suspended particles and appropriately sized foods from the surrounding water. Established specimens may gradually spread onto nearby rockwork and can reproduce by division or pedal laceration under favorable aquarium conditions.

Color, texture, and vesicle pattern can vary considerably among Rhodactis species and aquarium color morphs, so exact species identification should not be based on appearance alone. For this specimen, Rhodactis spp. and related species is the most scientifically responsible identification.

Care Guide:

Scientific Identification: Rhodactis spp. and related species
Common Name: Rhodactis Mushroom Coral
Care Level: Easy to Moderate
Lighting: Low to Moderate
Water Flow: Low to Moderate, preferably indirect
Placement: Lower to middle areas of the aquarium depending on lighting intensity
Temperament: Semi-aggressive; provide room for expansion and spreading
Reef Compatibility: Reef safe with appropriate placement
Feeding: Primarily photosynthetic; may also capture appropriately sized planktonic and particulate foods
Growth Form: Fleshy corallimorph disc with a textured surface of raised vesicles, attached directly to hard substrate by a basal foot
Water Parameters: Maintain stable reef aquarium temperature and salinity with reasonably stable alkalinity and nutrient levels. Avoid rapid changes in water chemistry.
Special Considerations: Avoid strong direct water flow that prevents the mushroom from fully expanding or causes the tissue to fold excessively. Acclimate gradually when moving into stronger lighting. Allow sufficient room around established specimens because Rhodactis mushrooms can expand considerably and may spread onto adjacent rockwork.