coral melting

Hello reefers. I cannot find my red pulsing xenia colony i had in my RS Max Nano G2 XL. About a week or two ago, the xenia was looking great, but it separated off the base it was on and attached firmly to nearby LR. Now all of a sudden, this xenia I've had for almost a year is completely...

my corals closed up one day and would barely open for the next two. I figured it was nothing and then just left it. Today I noticed white spots all over my frogspawn and my gorgonian was melting. A couple weeks ago I put an emerald crab in my sump to help get rid of the green hair algae. This...