My macro just died!

[danny zubot]

After being away for a few days this past weekend I finally had some time tonight to check out my tank tonight. Everything was fine with the exception of my macro algea. I have a 10 gallon shallow rubbermaid bin for a refugium and it was about half full of calurpa, until this past weekend I guess. I had noticed in recent weeks that it's growth had slowed, probably due to my new PO4 and NO3 reactor, but looked healthy otherwise. Tonight all but a few thin strands of the calurpa had literally liquified! It had the consistancy of brown slime, and fell apart in my hands when trying to remove it.

I had recently started feeding my corals more, a lot more, since the acquisition of a sea fan. So I thought the macro would have plenty of nutrients. Does this sould like a nutrient issue though? Or does it sound more like a disease, infection or even competition?