Acropora
Common names: staghorn coral, table coral, branching or plating Acropora Natural origin: Indo-Pacific, Caribbean
Sensitivity (Level 3 to 4): Acropora species are relatively intolerant of unstable and less than ideal conditions.
Sensitivity varies widely depending on the particular species and whether wild or aquacultured. To increase chances of success, do not attempt to keepAcropora sp. in tanks that are less than a year old. Significant fluctuations in temperature and/or water quality can be deadly.
Feeding: These corals have small polyps and poor prey capture ability. They consume foods of very small particle size. For example, oyster eggs, with a particle size of about 50µ, are a good food for these corals. In a well fed tank with a variety of food, additional feeding might not be necessary.
Lighting (Level 7 to 10): Though adaptable, Acropora spp. tend to grow faster and fair better under more intense lighting. The ideal lighting for any particular coral will depend on the species and/or the depth and clarity of the water where it was collected or cultured. As with any zooxanthellate coral, coloration can change in response to changing lighting conditions. And as always, sudden changes in lighting conditions can result in bleaching. Be sure to acclimate properly.
Water flow: Acropora spp. need strong, turbulent water for effective feeding, good health and to prevent sediment damage. Place these corals in the highest area of water flow in the tank.
Placement: Place safely away from aggressive corals and be careful of fast-growing encrusting corals that will compete for space.
General: Acropora spp. are often vulnerable to disease and predation by certain species of coral-eating flatworms, nudibranches, and tiny crustaceans called "red bugs." To prevent an infestation, carefully inspect and quarantine all new corals for 2 to 3 weeks before allowing them into the main tanks. Steady, healthy calcium (400 to 450 ppm) and alkalinity (3.0 to 4.5 meq/L) levels are important for coral health and growth.
Acanthastrea
Common names: moon coral, acan
Natural origin: Indo-Pacific
Sensitivity (Level 2): Care difficulty for these corals depends on species, but most are generally tolerant and forgiving when healthy.
Feeding: These corals have strong prey capture ability. In addition to feeding tentacles, these corals are also known to extend their stomachs, mesenterial filament bundles which dissolve and digest their neighbors. They should be fed at night since this is when they usually extend their feeder tentacles and/or mesenterial filaments. If after several weeks your coral is still not extending feeder tentacles, you can try to encourage a feeding response with night-time target feeding. When doing this, wait one hour after lights go off before feeding. Turn water flow off so that the food can fall and rest onto the coral. Give the coral an hour or two to "grab hold" of the food, then turn water flow back on. Do this regularly until feeder tentacles extend regularly in anticipation of feeding. Once your coral is readily extending feeding tentacles, it will be able to catch food from the current without any assistance.
Lighting (Level 3 to 6): These corals can adapt to a wide range of light intensities. Start by placing the coral lower down in the tank and move up if necessary. As with any coral, bleaching can occur if not properly acclimated to a sudden change in lighting.
Waterflow: Moderate water flow is recommended.
Placement: These are very aggressive corals. Their mesenterial filaments can and will dissolve the tissues of other corals within reach, so please give them plenty of space to avoid contact with other corals.
General: Like many corals, they can take some time to "settle in" to a new home. Wait a few weeks to see normal feeding behavior before worrying.
These corals are often confused for corals of the Faviidae family or for their Blastomussa and Micromussa cousins. Acanthastrea have exceptionally large, pointy septa (skeletal "teeth") that help distinguish them from other corals. However, you may never know exactly which kind coral you have without close examination of the coral skeleton.
Blastomussa and Micromussa
Common names: pineapple coral
Natural origin: Indo-Pacific
Sensitivity (Level 2): Care difficulty for these corals depends on species, but most are tolerant and forgiving when healthy.
Feeding: These corals have good prey capture ability and can feed on a variety of meaty aquarium foods. Smaller chunked meaty foods are preferred. These colonies can sometimes look like colonial anemones when their feeding tentacles are fully expanded.
Lighting (Level 3 to 6): Though they can adapt to a wide range of light intensities, these corals come from deeper waters and do best in less light, or indirect light. If they must be placed under intense lighting, they should be acclimated to this light as slowly as possible.
Water flow: Moderate water flow is recommended.
Placement: These are peaceful corals. Place safely away from aggressive tank mates. Most are not great competitors for space and will lose battles for space with more aggressive or faster growing corals.
General: There are only two species of Blastomussa, B. merleti and B. wellsi, which are easily distinguished from each other by the size of their polyps. The polyps of B. wellsi are much larger (~1-3") than those of B. merleti (<1"). Some species (such as Blastomussa merleti) have long, pipe-like polyp skeletons (corallites) that connect at the base of the colony. These types of skeletal structures allow for easy breaking off of single polyps or small polyp clusters. This makes fragmentation and propagation easy.




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