Issue with my weeping willow?

[BigDom75]

I have had this for about a month. It usually closes its polyps right when the lights come on, but then opens back up. I noticed the brown layer around the bottom, I usually dont see this because its always open. Is this just algae, I am in the middle of my ugly phase, or is this melting? I have never seen it closed this long. The other corals in the tank are all looking great.

 

[Mr. Mojo Rising]

How is the flow on it? Leathers love flow and can close up and fold over if not enough flow. Can you also advise your parameters and type of lighting?