So I already have a mature tank, bunch of lps and some softies with 2 clowns and a midas blenny. When I got into the hobby however my LFS set me up and gave me the salt water, sand, and live rock. they said run the pump with no light for a month and don’t add anything to kick start the cycle, waited for exactly one month and then added my first fish and then corals a purple months later; since then, I have never had an issue with a fish and at the beginning just some minor issues with corals as I needed to get my parameters steady. Question is: I see almost everyone post about adding things at the start to get the cycle going and I just waited a month and the nitrites and ammonia were at 0 by then by themselves, so why do people add things? just to make the process faster?