I have a colony of these that I have identified as Rhodactis indosinensis. They are 5 years healthy, although they have not grown much, moved, reproduced or spread like other mushroom corals in my system. The color is natural and varies. Sometimes the colors are reversed with green tips on fluorescent pink disks.
Raseri - You can obtain dyed corals, mostly soft branching corals like sinularia (finger leathers) but the practice is frowned upon, as they usually fail.