Here is what my 158 looked like when I had it. I could not run a skimmer on this tank, if I did the xenia would not pulse. I never had any phosphates to worry about and nitrates stayed below 2ppm. The only thing I ever saw mess with xenia was a pair of clownfish because there anenome wanted to move from one side of my 75 to the other, so they root plowed a trail for the anenome to follow, other than that it took over all three of my tanks. Frogspawn was the only thing to stand up to it. It is a great coral for a fish only tank at controlling phosphates and nitrates. It does not require a lot of light either, it grew very well under cfls and also under MH.