When to add LR??!! HELP

[dekay]

I'm actually getting cured rock from another member on this forum (Jeannette), preferably tonight as long as it's ok with you guys. But should I actually keep the cocktail shrimps in there? Cuz I took it out a day before I placed your LR and sand in.

Not sure if this makes sense, but you said the ammonia is kind of like food for the life inside the rock. What happens when the ammonia reaches 0. Does that mean they'll starve?