Unfortunately, there is a lot of garbage out there about this coral. The short of the matter is, there is no definitive information I've seen that determines what it does or doesn't like.
My experience with primarily Red Sea Pink Pulsing Xenia, however similar results have been seen with elongated, etc.
Myth 1:
People claim that it needs either a) dirty or b) clean water.
The answer is, neither are right. I know 3 SPS guys with the MOST pristine tanks possible where it thrives. It also thrives in a refugeium or sump area collecting waste.
Myth 2:
People claim it needs either a) high or b) low light.
Again, both neither right or wrong. I stress tested mine in two of the most extreme opposites available. At about 1600-1700 PAR directly under a 400w MH less than 3" from the surface, it thrived. I recently had it under about 5-10 par of homedepot/lows spiral compact florescent bulbs in my fuge, it thrived.
Myth 3:
It absolutely needs supplements of *insert flavor of the month here*
I can't test it, I don't dose it, period. 4 different salts over the years with different levels of makeup, no manual dosing of iodine, iron or anything of the like... always thriving.
Myth 4:
It needs either a) high flow or b) low flow.
Back to the fuge comment, it was in little to no flow and thriving. It also thrives within inches of a Vortech MP40 on short pulse and/or a Tunze Nanostream at full bore, ravaged with current, thrives.
Myth 5:
It requires a) high or b) low salinity
I had some live rock I was "cooking" with my own strategy for excess of three months (clean water, filtration, no fish, inverts, food, or anything else to add nutrients to the water). I left the concentration relatively low at 1.010, and it grew. I have old rock from my tank that I broke down over a month ago now where it's growing, and it's been at 1.035. Xenia still growing and mushrooms are still alive.
Myth 6:
*insert reason here* caused it to a) melt b) disappear c) relocate d) whatever else.
Truth is, no one really knows why some people can't keep it. I've sold and/or given out close to probably 200 frags over the years of mine. I'd say about 50% have had success. About 25% couldn't get it to take and gave up. About 25% I've given pieces to multiple times (and even received it from multiple sources besides me) and just can't seem to get it to grow and thrive at all.
Just my information based on tests I've run. Take it or leave it, but the vast majority of "it needs *insert data here*" posts are quite frankly unproven, outright guesses, or just plain wrong. Until someone runs real scientific tests, it's all guesswork.
