Deleted one of the posts because it was doubled.
Yes I have read about the iodine levels also. I do not check for it, so, I cannot say one way or the other.
the xenia is near the top of the tank in good flow and about 10 inches from 300 watts of halide.
How were the conditions in the place of purchase? Was it under MH
there? or under PC
? The light spectum could be not as intense or too intense at the moment, and it is taking time to adjust. Try moving it a little lower for a day or so, and if that doesn't do it, move it closer. How is the calcium level in the tank? do you dose with 2 part or Kalk
? I know, lots of questions, but more info is good...