Cycling a tank

[sumpfinfishe]

I sure hope you mean by dead rock that its 100% cleaned and dried rock because if it was recent lr that was simply just dried, then this rock needs needs to cure in a sw bath to clean off all the die off.
Adding a few small pieces of lr or a few cups of live sand will kick stàrt the cycle bigtime or you could add a dirty filter from a friends tank if your really desperate.