Oh no Tony!!! Keep your chin up. These things happen. It really sucks to have to take some steps backwards right when you start to feel happy about the tank. I think we've all had disasters at some point or another. I've had heaters fail twice cooking two entire tanks. Now I am smarter than the heaters.
I am due for a disaster though...maybe my recent brush with red bugs will cure me for awhile.
It's easy to toss in the towel and give up. Sometimes it's good to do that. Or downgrade. Everyone is always on the upgrade...sometimes downgrading is better!!
How are your corals looking?