I've had a rock of Xenia in my tank for over a month now and have noticed a strange behavior lately.

This morning I was doing some research (should have been working) when I came across an article by GARF that spoke to the ease in which this animal grows.

I haven't experienced any phenomenal growth, actually appears to be non-existant.

The article mentioned the use of something called Iodide, wasn't sure if this was a typo and should be Iodine? They mention SeaChem Reef Plus.

The particular strange behavior mentioned above is that my Xenia seems to flourish the majority of the day, but near the end of the light cycle parts of the colony seem to wither away to little replicas. The next day about an hour into the light cycle they are all again flourishing. 12 hour blue/8 hour with white. Total of 4 36" HO T5 across 72". The animal is about 11" from the surface.

Should I be feeding this guy? From what I understand they pull their food from the water column.