Name: Xenia elongata
Classification: Soft Coral
Common Names: Xenia, Pulsating Xenia
Pulsating Xenia has sturdy stalks up to 3" long which are tan
in color. The end of the stalk is covered with a crown of feathery
polyps, each carried on a stem approximately 1"-2" long.
The polyps open and close in an attractive pulsing or pumping motion.
Groups of these stalks form colonies that can spread into large
mats. Xenia is one of the few corals that actually smells bad when
removed from the water.
? Most specimens are captive grown
Hardiness: Xenia is an interesting family of coral as far as hardiness
is concerned. Some hobbyist cannot seem to keep this coral alive
and others find it to be a fast growing 'weed' coral. Although there
are some guidelines which can be followed to improve the chance
of success, no one fully understands what will guarantee success
with this coral. Even a colony that has been thriving in a tank
for an extended period of time can quickly go into decline and die
for no obvious reason.
Requires moderate to strong lighting. Usually, brighter is better
although some hobbyist appear to have very good success with lower
Water Current: Xenia require at least
moderate water flow. They are one of the few corals that seem content
to be right against the strong output of a powerhead. In still waters
the pumping usually diminishes and the coral goes into decline.
Temperature: Does well within a range
of at least 75º to 83º F. Temperatures around 84º
can sometimes appear to cause stress and Xenia appears to be more
stable at lower temperatures of 76º - 78º.
Aggressiveness: Low. Xenia does not possess
any apparent stinging capability and will not bother other corals,
but can tend to grow over and shadow its neighbors. When happy,
the coral can reproduce by division at an alarming rate and may
require frequent pruning to keep it from crowding out other corals.
Feeding: Xenia is photosynthetic and does
not accept any known foods. It is thought that they absorb some
of their nutrients directly from the water. In fact, some hobbyist
keep large colonies of Xenia as filter beds where the xenia is regularly
pruned for nutrient export. It is unclear if this is very effective.
Xenia may do better in tanks that are not heavily skimmed.
Supplements: The main supplement normally
associated with successfully keeping Xenia is Iodine. Many authors
state categorically that iodine supplements are critical to success
and lack of iodine supplements will cause xenia to crash. I have
keep Xenia with and without iodine supplementation and have observed
no difference, so I am more skeptical of the iodine connection.
Low Alkalinity levels can cause Xenia pulsing to decrease or cease
altogether, so alkalinity levels should be monitored and kept above
a minimum of 2.5meq/l.
Tank Positioning: Usually kept high
up on the reef for strong water flow and highest possible lighting.
Xenia will reproduce in the tank by attaching its stalk against
adjacent surfaces it contacts and splitting into two colonies. In
this way, Xenia colonies tend to 'walk' in the direction that water
movement bends their stocks, so you may want to consider this in
your placement. Xenia can usually be coaxed to grow up the back
glass of the tank and forms a nice background display.