Also, if your "coral" is dead, and isn't going to decay any further, then I'm not even really sure you will get an ammonia spike out of it. If your trying to cycle your tank, i would add a dead shrimp to it (or any dead fish would probably work really) and let it put out some ammonia, remove it, and let it cycle. But, you might want to wait for someone like grahpixx22 or dakar or someone of that nature who knows more about the hobby then me.