Went through the same thing here down in NJ...lost all my fish. Inverts have pulled through, and the tank is starting to go back to its former appearance (minus the fish, of course).
Remarkably the #$%(* aiptasia has managed to survive where everything else died.
Basically, what I did was remove all the corpses I could, and then test the water around every other day to see what the levels were at. After a week, 10 days of solid zeros, I added a fish to see what would happen and so far (knock on wood) it seems like I may be okay...may even be able to avoid having to cycle it through again.
So for now its a lone copper banded who I'm hoping will house the aiptasia....once I'm convinced the rock is really doing what it should be, copper banded goes back to the LFS
and I start from scratch with fishes...
Oh and yea, I have a gennie now too.