they are not what I consider blue-they fall into the realm of white/light blue and that is how the appeared when you bought them-they also probably had green skirts. The hotter the color the higher the light, for the most part.
The guy at the LFS has about as much experience in zoanthid care as I do in 18 wheeler engine repair-those polyps will feed off of nutrients, light and nothing else. What is your lighting and have you dipped them for critters? good luck
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"without deviation from the norm, progress is not possible"
F-Zappa
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