Corynactis are a colder water species. Pseudocorynactis are a warm water species. You probably have the pseudo.
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Corynactis
Corynactis spp. are mainly temperate species, known as Strawberry anemones. They are small, not usually larger than one inch (2.5 cm) in diameter, and colonial, reproducing by fission and pedal laceration to cover large areas of rocks. Tropical species may occasionally be introduced to aquariums with live rock. The tropical species are less colorful, tend to be cryptic, and form much less densely packed colonies. All Corynactis spp. feed on zooplankton and particulate organic matter. To keep them healthy and encourage division, they need to be fed at least several times per week. A "milkshake" of chopped seafood can be used, but they will also take flake or pelletized foods, and frozen shrimp or worms.
The expanded polyp of Pseudocorynactis caribbeorum. Note the orange ball-like tentacle tips for which the Orange Ball Anemone is named.
Pseudocorynactis
Pseudocorynactis spp. are like Corynactis but are much larger (to about six inches (15 cm) diameter, and usually not colonial. They also reproduce by fission, but it is unusual to find more than about six clones together as a group. The so-called orange ball anemones that can be observed on coral reefs at night are Pseudocorynactis spp. The column varies in color from cryptic shades of brown to orange, red and magenta. The tips of the tentacles are commonly bright orange, but they can also be white. These tentacle tips are extremely sticky, like flypaper, due to the presence of powerful nematocysts. This fact makes the larger species from the Indo Pacific region unsuitable for aquariums housing fishes, which they readily capture. They also can catch mobile invertebrates such as shrimps and snails, and sometimes "attack" sessile invertebrates growing on adjacent rocks, enveloping them in the gastric cavity through a widely opened mouth. Pseudocorynactis spp. can be fed daily, but only require twice weekly feeding to keep them healthy. If they are not fed frequently enough, they shrink. There is a marked behavioral difference between the common Caribbean and Indo-Pacific species.
The Caribbean species, Pseudocorynactis caribbaeorum mainly opens its tentacles at night, and closes rapidly when it senses light. The Indo-Pacific species remains open both day and night, and is not sensitive to light. The presence of food smells (dissolved amino acids) in the water stimulates either species to open up and extend the tentacles, and the caribbean species can be trained to open in the light by feeding it during daylight hours. The mechanism for its apparent memory is not known.
Whether you have a large reef aquarium or a simple small aquarium, any of the corallimorphs can be easily maintained and enjoyed for decades.
