Glad to see
The raw shrimp is added to spur on the ammonia process thereby beginning the growth of the bacterial chain that will help process nutrient in the tank. Adding one large shrimp for every 50 gal
of tank volume is usually recommended. If the LR
you are using is completely uncured, you may not need to use the shrimp as the die off from the rock will fuel the process instead.
Once ammonia has peaked and begun to fall, the shrimp can be removed (hold your nose) and the tank will finish cycling. It is important to continue to feed the bacteria once the shrimp has been removed. Add very little fish food about once or twice a week to keep an ammonia source until waste producing animals are added later on. >>Here
<< is a very "loose" timeline to what you are looking at. Some take less some take more time but it will give you an idea of what to look for.