By Bob Goemans
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Family Discosomatidae

Rhodactis sanctithomae

(Le Sueur, 1817)

Mushroom Coral

Likely Reef Tank Suitable

Likely Fish-Only Tank Suitable

Range: Western Atlantic Ocean: Florida, Bahamas, Bermuda, and the Caribbean.

Natural Environment: Inhabits various nutrient rich coastal areas.

General Husbandry: Has a yellowish green or purplish-mauve color and a generally bump free surface area.

Requires slow water movement and moderate lighting.

Moderate light and currents suit them well!

They can be fed small pieces of fish/shrimp flesh.


    Kingdom: Animalia

    Phylum: Cnidaria

    Class: Anthozoa

    Subclass: Hexacorallia

    Order: Corallimorpharia

    Family: Discosomatidae

    Genus: Rhodactis

FYI: Easily propagated from cuttings.

Provide enough space between them and their neighbors!

Was previously called Discosoma sanctithomae, (Duchassaing & Michelotti, 1860).

Experience Level: Beginner

Diet: Photosynthetic/Carnivore/Plankton feeder

Temperament: Slightly aggressive

Aquarium Environment: Reef or fish-only aquarium

Coral Safe:With caution

Fish Safe: Yes

Invertebrate Safe: Yes

Acclimation Time: 30 minutes+

Aquarium Hardiness: Hardy

Calcium (Ca): 380 - 430 mg/l

Alkalinity: 2.5 - 3.0 meq/l

Phosphate (PO4): <0.05 mg/l

Magnesium (Mg): approx. 1350 mg/l (relate to specific gravity)

Strontium (Sr) 8 - 10 mg/l

Temperature Range: 72 - 83°F (22 - 28°C)

Minimum Tank Size: 30 gallons

Lighting: PAR 200 - 300+

Water Movement: WM 1 - 2

Specific Gravity: 1.023 - 1.025

pH: 8.0 - 8.4

Iodine/Trace Elements Monitor/as necessary to maintain quality seawater.

 Rhodactis sanctithomae (Mushroom Coral)
Photo © Vincent Hargreaves
 Rhodactis sanctithomae (Mushroom Coral)
Photo © Zaid Fadul
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