Join Date: May 2015
Location: british columbia
I will agree with the others that as long as they have hiding spaces, an aged tank is better for them. Some may get eaten but remember, shrimp are near the bottom of the food chain and "know" it. They are made to be able to escape if they can with quick movements and hiding, if not "survival of the fittest."
But to answer your question for jump starting the cycle, you can either put extra supplies in your running tank (extra stuff in the filter, and extra substrate) and then move it to your new tank when you're ready to set it up.
Or you can just take some of the filter media from your running tank and add it into the new filter. You could also take some substrate and put it in your new tank.
Both of these are basically the same, only difference is the first way, your adding stuff and waiting for bacteria to grow on it, the second way you're taking stuff that already has bacteria on it.
There are also bottles of stuff such as safe start that can speed up a cycle.
But in the new tank, there won't be any or will be a very small amount of microscopic food for the shrimplets and the smaller water volume means the water parameters change easier and faster.