St. Thomas Mushroom (Rhodactis Sanctithomae)
A soft coral with bulb-like or flame-like tips, St. Thomas Mushroom is known for its gentle appearance and ease of care. It thrives in low to moderate lighting and requires gentle water flow. This coral can be placed on the sand substrate and will naturally settle into its position over time.
It pairs well with other corals as long as they are kept at a safe distance. Due to its stinging capability, it is recommended to space it away from other sensitive corals to avoid damage.
While photosynthetic, St. Thomas Mushrooms benefit from supplemental feeding with zooplankton or brine shrimp for optimal growth.
Color variation is typically green or blue. These specimens are plain in appearance and are usually 1″ to 2″ in size.
NOT RED IN COLOR
| Feature | Detail |
|---|---|
| Species | Rhodactis sanctithomae |
| Size | 1″ – 2″ |
| Lighting | Low to moderate |
| Flow | Gentle |
| Substrate | Sand |
| Feeding | Zooplankton, brine shrimp |
| Color | Green or blue (not red) |
FAQ
What is the ideal lighting and water flow for St. Thomas Mushroom?
St. Thomas Mushroom requires low to moderate lighting and gentle water flow for optimal growth.
Can St. Thomas Mushroom be kept with other corals?
Yes, but it should be spaced away from other corals due to its stinging nature.
Does it need to be fed?
While photosynthetic, it benefits from supplemental feeding with zooplankton or brine shrimp.

Penelope Simpson –
Easy to set up and has grown steadily in my tank. I placed it on the sand and it settled well. I keep it a few inches away from other corals to avoid any contact. It looks nice with green and blue tips and doesn’t turn red as expected.
Gordon Hart –
Grew well under moderate lighting. I feed it a few times a week with brine shrimp. It’s not aggressive, but I make sure to keep it far from other sensitive corals.
Justin Walker –
Perfect for beginners. The coral is soft and doesn’t damage nearby ones when properly spaced. It has a natural flame-like appearance and blends well in the tank.