Second benefit of buying rocks that are already cycled:
change all or most of your water out for new made water, and add some starter corals, couple of snails etc. Wait a bit longer for fish, research quarantine of fish and see if you want to go that way. But regarding a couple starter corals and some clean up crew, you have the green flag after the water change
This isn't speeding, rushing, or breaking rules. A doctor doesn't put a light sprained ankle into a full fixed cast, those are for breaks. And when the break is healed, they don't keep the cast on arbitrarily it comes off when healing is complete
Your rocks have the same baseline average amount of bacteria on them now as they did on day one in your tank, or two years ago, so we're simply matching a new bioload to that detail. The thread above details that once cycled, a set of rocks doesn't uncycle as long as they're simply kept wet.
Your new tank looks nice and clean, can't wait to see it with some life, you paid extra for rocks that bring some age and maturity instantly into your tank
Since the cycle is done, we should make an algae game plan.
So let's say it's March, and light green hair algae is tufting along the top part of the rocks, what do you do?