Pearl Bubble Coral (LPS) (Physogyra spp.)
| Pearl Bubble Coral (LPS) Physogyra spp. | |
|---|---|
 | |
| Name | Pearl Bubble Coral (LPS) |
| Name Lat. | Physogyra spp. |
| Family | Hammer Corals |
| Family lat. | Euphylliidae |
| Order | Stony Corals |
| Order lat. | Scleractinia |
| Origin | Indo-Pacific |
| Diet | Autotrophic, planktivore |
| pH | 8.1-8.4 |
| Hardness | 8-12 °KH |
| Lighting | High |
| Current | Moderate |
| Behavior | Aggressive |
| Keeping | Colony |
| Care Level | Moderate |
| Life Span | N/A |
| Protection | CITES Appendix II; EC Annex B |
| Metric Units | |
| Size | < 80 cm |
| Temperature | 24-27 °C |
| Salinity | 33-36 ‰ |
| Aquarium | 200 l |
| US Units | |
| Size | < 31" |
| Temperature | 75-81 °F |
| Salinity | 1.020-1.025 sg |
| Aquarium | 50 gal |
Distribution and habitat
Physogyra spp. belong to the group of LPS (Large Polyp Scleractinia). These reef-building corals are widely distributed in the Red Sea, tropical Indian and Central Pacific Oceans. They occur according to their species and origin in different colors in colonies up to 1 m in diameter on scree surfaces in the forereef and in calmed shallow water down to medium depths (15 m).
Maintenance
They should be positioned in a place with higher light intensity and moderate, alternating flow. Only lime-rich, heavy metal-free substrates should be used as substrate
Filters, skimmers and heaters are necessary to ensure water quality, as well as pumps to simulate tides, swells and bottom currents. It is recommended that live stones be used to set up the aquarium. The bacteria living in the porous stones act as a biological filter. The lighting must correspond to the species-appropriate day-night rhythm of the animals
| Salinity: 33-36 ‰ | pH value: 8.1-8.4 |
| Carbonate hardness: 8-12 °KH | Nitrate content: 2-8 mg/l |
| calcium content: 420-450 mg/l | Nitrite content: 0.0-0.05 mg/l |
| Magnesium content: 1.250-1.350 mg/l | phosphate content: 0.01-0.1 mg/l |
Regular addition of trace elements, especially calcium and strontium, is recommended. For salinity, an average value should be aimed for, which may only vary slightly by +/- 0.5 ‰. Ammonia and ammonium must not be measurable. Special attention shall be paid to consistently good water quality and water values.
Diet
Zooxanthellae, which are unicellular symbiotic algae, live in their tissue and provide them with assimilation products of their photosynthesis (high light requirement). The zooxanthellae promote growth and provide additional food to the plankton and small particles that are collected in large quantities from the water current. Thus, in addition to the food produced in the aquarium during fish feeding (mysis, krill, Artemia, etc.), commercially available supplementary food in the form of phyto- and zooplankton should be offered regularly
Regular and varied feeding promotes health and prevents deficiency symptoms.
Behaviour and compatibility
They should not be kept with fish that consider their polyps food (e.g., angelfish or butterflyfish). Since they are heavily nettled and expand a great deal during the day and develop long tentacles during twilight, a sufficient distance from other corals must be maintained. They are sensitive to touch.
Reproduction and breeding
In nature, reproduction is sexual via marine larval stages. Reproduction by formation of daughter colonies (budding) is possible.
Species protection
Species protection: WA Appendix II; EU Appendix B. The proof of purchase is the required proof of origin for the animal. Please keep it safe! Your pet store will be happy to provide you with further information.
Important
The bubbles that form from the tentacles serve to increase the surface area for the zooxanthellae. They are very aggressive towards other corals. Physogyra are easily confused with Plerogyra. Physogyra have smaller, more pointed bubbles. Supplemental Actinic light (short wavelength, violet-blue light) illumination is very beneficial to their growth (zooxanthellae).
A calcium reactor and magnesium metering pump are recommended for the necessary steady supply of calcium carbonate and magnesium. Too high temperature, insufficient lighting or current as well as sudden change of water values can lead to tissue decay (RTN - rapid tissue necrosis). When purchasing, look for pressure marks or other tissue damage. Newly introduced animals must be accustomed slowly to the water in the aquarium
If different species are kept together, make sure that fish and invertebrates match each other in terms of water quality and temperature requirements as well as their social behavior, and that the setup meets the ecological needs of all species kept together. Further literature can be found in your pet store.
References
Text: petdata; Image: Alex Rinesch
Source: ENGELMANN & LANGE (2011): Zootierhaltung - Tiere in menschlicher Obhut: Wirbellose, Verlag Harri Deutsch; VERON (2000): Corals of the world, Australian Institute of Marine Science