It is something similar to Xenia. Some just treat them like weed (both the coral and the worms), while some never can keep they alive for more than half a year.
IME, the coral will do well in high light (porites sp. requirement) while the worm like modest to mid-high flow. They takes forever to grow. I have a piece that is several years old (like 4 or 5 yrs, as part of Jeff's 10 for $99 deal), and the diameter probably increased by 1/8 of an inch ? :?
Oh, the Porites coral goes thru several shades of colors in the mean time... from brown->light green->blue edge ->light brown, etc..
