I got a chalice a while ago from a local reefer, it was all browned out and not much to look at. He gave it to me for next to nothing because of this. Well after about a month in my tank it started to color up nicely. It's turquoise with pink eyes, I'm sure it's got a name because I've seen it before, just not sure what it is off hand. Anyway it has started receding and I'm wondering if I should dip it in iodine, or if chalices can handle an iodine dip. Don't know if it's a bacterial thing or not. My parameters have not really changed since adding it. I did take the gfo offline, and removed the optics on my LEDs, but this guy has been pretty much tucked under an overhang so I don't think it's the lights. Any thoughts?