Just to share my experience when i first started...
I am running on my second tank now, the first one of which i started and almost immediately before my cycle was completed i was trying to get my parameters in check with additives, stressing about why some levels are too high or low, etc... And it indeed did create a huge issue for me trying to keep my tank stabilized.
My second tank, which i didn't cycle with fish or anything. I used Dr. Tims, let my tank sit for about 4-5 weeks, tested to make sure my cycle was finished, and to my surprise the whole tank literally stabilized it'self as time went by. I have not done any testing for about 3 months now. Occasional Ammonia check every week or two... but that's it. During the cycle period your parameters are literally going to be out of whack and will give you a headache trying to understand it all... By giving it time, it reaches a happy balance on it's own and will maintain that balance as long as you keep up with water changes and really provide good husbandry and keep the tank clean.
Tip: a water change is literally the BEST thing you can do for your tank. Also, I have very healthy corals, happy fish, and corraline already growing and my tank is about 5 months old now... with NO additives. Only thing i use is Chemipure Elite, and filter floss. I keep up with weekly water changes and stir my sand bed every week, not too crazy but just run a chopstick through it a couple times. I also siphon out really big piles of poop i see in corners or crevices, and blow my rocks with a baster every 2 weeks or so and let my filter suck it all up..
less is more to be honest, just keep up with water changes and you'll see how well your tank will do naturally. If nobody has told you yet, when you stock fish, do it very slowly. Like a week at a time, to make sure your filtration can keep up with it. Nothing good ever comes out when you rush in this hobby.