+1 to what others have said. It sounds like you're doing well without. You'll just have to stay ontop of things and keep an eye out for signs of a problem, like coral closing up, or fish acting weird. Typically since coral are the most sensitive to water chemistry, they are a good gage for how the tank is doing. As the tank matures, testing doesn't need to be as frequent, also you get better at realizing if there is an issue just by how the tank is behaving.
You might get deeper into the hobby, adding protein skimmers, sumps to hide equipment away, quality test kits...etc. or you may just find you're content with where you're at. The hobby is addictive, and although I started because at the time I didn't want to have to walk a dog constantly due to time restrictions, I thought a nice fish tank would be easier. Then I got too deep into the hobby, and now spend a fair amount of time working on it, plus also have a dog
My advice at this point would probably keep the system as you have it now since you say everything seems to be doine well. If you decide you'd like to upgrade this and that, add things to the tank...etc. Than I'd first look into upgrading to a bigger tank. a 29gallon is a good started tank (mine was 37 gallon, same size but taller). Luckly, I bought all of my equipment rated for a tank of 75 gallons, because I eventually got a great deal on a 65 gallon while I was looking for a 210gallon tank. It's rough spending lots of money for equipment on the tank you have now, if you're gonna get a bigger tank down the road just to have to buy it all again.