Cant argue with your success . Good to know that alk is your least stable parameters and it sometimes drops to 5--how bad could that be on color or survivability. I think you are fortunate that you do not bother checking Calicum and Magnesium because darn it they are always high. And pests, keep an eye on them and add a 6 line wrasse and it sounds like your are definitely on the way to being pest free. Don't need no stinking sump and calcium reactor for sure. I mean if you just stop to think about : If your calcium and mag are always high with water changes. And its just your alk that drifts to five and all over the place, and you wouldn't want a ca reactor or need the sump for a protein skimmer? You do have good flow which is great, what kind of flow do you have, the kind that blows like crazy, a cool breeze, random or chaotic flow, gyre flow and or water moves pretty darn good any way you cut it. You basic approach is working so well for you and I am glad. There is nothing to read or learn or discuss on the forum for you. You have found the secret without all the handwork, attention and detail everyone else requires. You are have obviously keyed in on the important aspects of reef keeping and have figured to stay away from the meaningless ones. Kudos to you. NO reason to build on the experience and knowledge base of others when you have so smoothly zeroed in on success. I mean really, we could have a discussion of the value of testing alkalinity, calcium, magnesium, nitrates , phosphates, salinity, temp, flow design and other characiereists. But why, you seem to have a great simple basic solution Love to see see your tank and corals. Fun to see growth, coloration, whatever parameters you do record and follow. If you run a small enough tank, then maybe all you do need is a water change or not. Interesting reading, love to see pictures of your tank, how long you have had it. The bottom-line is that there are many ways to accomplish well maintained reef tank. I am not sure i would approach reef keeping the ways that you are. Some reefers are luckier than others and some reefers are smarter than others, of course there are those reefers that are neither smart nor lucky but that is for another day's discussion