I have just found about a half dozen Pseudocorynactis in the rock work out of the light in my tank. I believe they are the Caribbean type as they close up in the light. I think this because with my MH on yesterday I fed the coral, (Coral Frenzy, Frozen Cyclopleeze, Seachem Reef Plus and some DT's), with the return pump off but the Koralia's on. I started looking at the tank with the magnifying glass and saw one tucked up in a shaded spot on the rock. As I looked around more found another then another until I came across about 6 of the little buggers. When the feeding was done and I turned the return pump back on they started closing up. When closed you cannot tell what they are except for a white spot on the rock. Here is something from Julian Sprung on them.
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.
Mine are small at this point and I am starting to get information that the Lysmata wurdemanni (peppermint shrimp) will not destroy these as they will with Aiptasia. One person said to try boiling water. I suppose some of the Aiptasia control stuff might do the trick too, but have not verified this yet.
I want to say this tank and the rockwork in it are now about 1.5 years old. The only recent addition to this tank is a pc. of Pavona varians about 3 weeks ago. It was a small pc. about 2" x 1" and I examined it for anything on it before I added it and saw nothing. WHAT THE HECK!
My plan is to now try to control these corallimorphs with whatever means may work short of ripping out the rocks and "cooking" them. If I cannot I may move on to a new biotope (no more reef flat
) possibly a patch reef or an island with an anemone and some clowns.
Don't have pics yet as when I saw them last night I was in shock that they have appeared so suddenly. Will get some as time allows.
Thanx all for listening.