© Emanuele Santarelli / CC BY-SA 4.0Sympodium
Sympodium is a soft coral that spreads across rock surfaces from a thin, mat-like encrusting base, densely packed with small polyps each bearing eight feathery tentacles. Belonging to the Xeniidae family, individuals with blue or green fluorescent coloration stand out beautifully in the aquarium. It grows and spreads quickly, making it a good choice for aquarists who want to build a striking, well-established area within their layout. While its care level is considered intermediate due to the attention needed for water quality and lighting, a well-maintained colony can thrive steadily once the basics are in place.
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Sympodium key facts
- Care level
- Intermediate
- Temperature
- 24〜26℃
- Diet
- Mainly nutrition from its zooxanthellae, with micro-plankton or foods for filter-feeding invertebrates as a supplement.
- Lighting
- LiveAquaria lists xeniids as high-light corals, so provide medium to strong light; adequate light is needed to keep the fluorescent colour.
- Flow & Placement
- Give it moderate flow and set it on a flat rock it can encrust. It spreads over neighbours, so leave a gap at the boundary.
- Water Temperature & Quality
- Water 24-26C, specific gravity 1.023-1.025 (salinity 33-35 ppt), pH 8.1-8.4, KH 8-12. Iodine and trace elements are recommended.
- Feeding
- Most of its nutrition comes from photosynthesis. Micro-plankton or foods for filter-feeding invertebrates offered about once a week are beneficial.
- Notes
- It encrusts as it spreads, so manage the boundary to stop it climbing onto neighbouring corals. It is easily confused with other genera in the family and trade names alone do not identify it. Having no stony skeleton, it is not covered by the CITES coral listings.
About Sympodium
Discover the characteristics, care tips, and common questions about Sympodium, a soft coral known for its striking blue and green fluorescent colors.
7 things to know before welcoming a Sympodium
1Plan for Fast Spreading
Sympodium spreads its mat-like base along rock and tank surfaces and is known for growing quickly. Leave adequate space between it and neighboring corals, and think ahead about how you'll manage it if the colony expands more than expected.
2Balance Water Flow and Lighting
Steady, gentle water flow and moderate lighting help the polyps extend fully. Excessively strong flow can prevent the polyps from opening, so adjust the current while observing how the colony responds.
3Water Quality Management
This species is considered suitable for intermediate keepers, requiring solid fundamentals in stabilizing temperature, salinity, and nutrient levels. It's worth confirming your tank environment is already stable before introducing it.
4Fluorescence Depends on Lighting
Individuals with blue or green fluorescence are especially prized for their appearance, but how vivid the color looks depends on the intensity and type of blue lighting used. It helps to picture how it will appear under your own tank's lighting before bringing one home.
5Watch for Contact with Other Corals
Because it spreads readily, contact with neighboring corals can cause stress to one or both. Check the colony's growth regularly and consider trimming it back if needed.
6Acclimation When Introducing
Right after transport, the polyps may stay closed due to the stress of environmental change. Take time to acclimate the coral gradually, such as with a drip method, so it can adjust slowly to your tank's water conditions.
7Avoid Frequent Relocation
Since it spreads by attaching its base to rock, moving its position frequently can hinder settling and growth. When choosing a spot in your layout, consider how much room it will need as it spreads over time.
Frequently asked questions about Sympodium
- Q.Can beginners keep Sympodium?
- A.Its care level is considered intermediate, so some experience with basic water quality management is reassuring. It's best to consider introducing it once you can reliably maintain stable temperature and salinity.
- Q.Why won't the polyps open?
- A.The polyps may stay closed shortly after being introduced to a new environment, or if the water flow or lighting isn't well suited. Give it time after introduction and try adjusting the flow or placement while observing how it responds.
- Q.Can it be kept alongside other corals?
- A.Because it tends to spread, spacing from neighboring corals needs some care. Contact can stress one or both corals, so allow enough room when placing it in your layout.
- Q.Is it subject to any legal regulations?
- A.Sympodium is not subject to CITES.
- Q.Will the blue and green coloring always look vivid?
- A.How vivid the fluorescent coloring appears depends on the type and intensity of your lighting. It tends to look more vivid under lighting that includes blue-spectrum light.
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