For the ones that can't keep Zenia.Are you using any Potassium Iodide 1% in your system,or even PFI ? They love the stuff.Also will help all your other corals,including coloring up your SPS's even more?What they really thrive on is DT's which it seems a lot of folks don't use as much anymore.I had to rip ever piece of Zenia out,it grew like wild fire.And spread everywhere.
Also Z-nut talk to you on Sunday.