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Are the tips receding? Or are they just white with polyps sticking out? Looking back at the picture, it may not by dying
Could you get a close up pic by chance?
personally, i have never ordered corals from online retailers, for me i like to see what im getting before i make the purchase. Also most LFS's are willing to negotiate and like @erics210 mentioned, most have sales that you can take advantage of. what LFS's have you visited @Ruth C Lewis ?
could be a pocillopora coral.....maybe try lowering it a bit....could be getting blasted under a hot spot
but if you had it for 6months, could be something else that recently bothering it