Anemones died now what?

I recently had several fish die do to lack of skimmer and poor water quality. It was a few days before I noticed, but my two Anemones had died also. Once I pulled them out I started noticing a strange mold growing on both the rocks along with the sand around the rocks that the Anemones were attached to. Any one have any idea on what that is? Can I just clean out the bad area and do a water change or should I start over with all new sand?
 
Siphon out the crud. Replace siphoned out salt water with new salt water. See where you are at with ammonia, nitrites, and nitrates with test kits. That's a start anyway.

David
 
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