I have had some very good luck with xenia, I have had a couple of near meltdowns. When i notice my xenia acting starange i know its either time for a water change or time to change out my carbon, or both. Are you running any carbon, if so have you tried to change it and see if that helps? When you move xenia, or add it to your tank it produces an unreal amount of chemicals and mucas. the carbon will help with that. I have started to add a few peices to my bags of xenia frags to help during transit, and i have had a 100% survival rate as of now (knock on wood)