I usually tend to slightly overfeed my tank. 80% of my livestock are filter feeders to some extent. Therefore, my nutrient levels are elevated. Xenia does extremely well in my tank. I have a 92 gallon tank (24" deep) and I notice the Xenia in the top 10 inches of my tank multiplies much faster and in greater number than the rest of the tank. I agree with everyone on here about the stability of pH, alk, and Iodine. Most Xenia colonies will crash for a time, though. So don't get your hopes up too high. It will cycle in your tank if it has been there for some time. There will be mass propagating for quite some time, then a mass die-off. It usually regrows itself though.