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What you are describing is called "seeding". Seeding is when you move rock or sand or filter media from an old tank to a new one. When you move these items from an established tank, you are also transplanting the nitrifying bacteria that these items play home to. This will help to shorten cycling.
When it comes to cycling a tank, there are many effective ways to get this done. As a traditionalist, I just drop a raw cocktail shrimp into the tank and let it rot. Watch your ammonia; it will rise. In response to the rise in ammonia, your nitrifying bacterial colony will grow to accommodate the load. As this happens, you will see that your ammonia level will begin to drop. When your ammonia is ZERO, you know that your nitrifying bacteria colony is in balance with the bio load.
Remember; every time you add livestock to your tank, you are increasing the bio load. So when you test after adding livestock, you will see a rise in ammonia until your nitrifying bacteria grows to accommodate the additional load.
And because of this, it is VERY important not to add too much at the same time. Fish in the tank will tolerate small ammonia spikes when you add a new fish. But if you add 4 fish over the course of a month, the elevated ammonia levels are damaging to fish gills and can kill them.
I have a hard and fast rule of 4 months quarantine before going in to any of my display tanks. That amounts to three fish per year. Sometimes, people add 3 or more fish per month, which is too many too fast.
Would 2 fish be okay to add at once after quarintine? Like when i initially add livestock


