My galaxy coral is missing a head !

[Nemoydori]

I've hand a galaxy coral for a month and just yesterday I've notice some white spots on some heads and this morning I saw a missing head and the head next to the missing one started missing its little greed dots :0/
Any ideas what can be happening ?

 

[BountyOfCoral]

hey i know the answer to your galaxy coral problem

Galaxy coral is a LPS so make sure that you have about 2-4watts per gallon. If that doesnt work try putting him closer to the top of your tank where it can get the most possible light