[murphreef]

looks like a tri color valida... id move it back... once sps get acustomed to a certain spot in the tank and you move it even an inch in your case the flow changes the light changes and it can stress them out causing it to bleach... im not sure it thats the only issue but from what you are describing it sounds like it.... i have a valida that i tried putting high in the tank once and within a week it was bleaching so i moved back to the bottom of the tank where it had been used to and it recovered very fast... make sure also that there are now AEFW's tri colors are one of there favorite foods and i know that they can stress a coral out like that as well.... my opinion is that the move did this