So I hope this is corrected by now (or most likely everything is dead).
In the future with ammonia levels that high, a 100% water change would be less stressful then the corals and fish living in those toxic conditions.
Products like Amquel will neutralize the ammonia.
With readings that high, and live stock still living I would check a test kit and see if perhaps there are chloramines, or chloramine neutralizers in the water as they can register as ammonia on test kits.
When fish are exposed to such high levels of ammonia a meth blue bath will help to ease the burning of there gills.
The macro going sexual has never caused an ammonia spike IME, however if you need some more macro and are close to Beaverton, come on over, a have a bit . . . More like an ungodly amount, but I'll hook you up. I threw away a quart sized bag stuffed yesterday, but still have more.
IME a single fish death would not cause a blip on the ammonia in my systems, or other well established tanks. Don't know the history or size of your tank in particular.
HTH
Sorry I didn't see this sooner.