Xenia umbellata: living card for pulsing xenia

Xenia umbellata (pulsing xenia) captivates with movement and frustrates with inconsistency. In some systems it invades; in others it melts without clear warning.

Quick read

• Type: pulsing soft coral.
• Aquarium: stable reef with measurable nutrients and isolated space.
• Light: medium.
• Flow: gentle to moderate, without flattening polyps.
• Indicative temperature: 24-26 C.
• Salinity: 1.024-1.026 SG.
• Alkalinity: 8-10 dKH.
• Calcium: 400-450 mg/L.
• Difficulty: low-medium; may thrive too much or collapse.

What to check before placing it

Choose upright colonies with no transparent stalks or decaying base. Do not buy it to correct nutrients: buy it only if you accept its growth.

Before gluing a colony, think about its future size, the direction of flow, and whether you could remove it without dismantling half the rockwork if something goes wrong.

Placement and coral reading

Place it on an island or easy-to-trim zone. If it touches the main rockwork, it can walk and colonize places you did not choose.

Read the first week outside the blue-light photo. Watch extension, tissue, response to flow, and irritation signs when the aquarium is in its normal rhythm.

Working parameters

Do not dose iodine blindly to force pulsing. Measure, observe, and prioritize stable salinity, alkalinity, and nutrients.

In a reef, stability means repetition: salinity, alkalinity, temperature, and nutrients inside a window the aquarium can sustain, not perfect numbers from one test.

Compatibility and warning

It can shade and occupy space from slower corals. Treat it more like an invasive reef plant than an innocent ornament.

Collapse, soft stalks, or total lack of pulsing for days require checks on recent changes, salinity, and organic buildup.

Reference sources

WoRMS for taxonomic reference; LiveAquaria, Tidal Gardens, and specialist reef guides for practical light, flow, and stability ranges. Values are indicative and must be adapted to the real history of the system.