[Enigma]

I'm mulling this over.

It looks like most of your corals are softies. You've got cyano, and what I'm guessing is bryopsis (the green stuff). It is difficult to tell from the photos on my iPad. I'm going to have to look at the photos on a computer. If you filter/skim aggressively you may loose some of your corals. I personally can't keep Xenia: it requires more nutrients than my display system provides (but I still have algae and cyano).

You need to pick off the green algae. But, don't let any get loose in the tank. You can't treat with H202, as that will certainly kill your Xenia.

I would definately add a bag of Purigen to your media basket. I would also definately skim.

Do you have any idea what your phosphate and nitrate levels are?