The tank looks great! Is that plating acro a soli or an efflo? Whichever it is, it looks great. Everything looks excellent. I like the growth pattern on your monti Setosa.
I'm surprised that there isn't a "Water Change Police" like the Tang Police here on RC, lol. I, also, love the minimalist/open look of your tank. I hope you have discovered some sort of secret that will eliminate the need for water changes, but for now, I'll have to stick with weekly water changes, because I've seen what my tank and corals looks like (with the exception of one tiny mushroom, that snuck into my tank on the same rock as an Australian acan colony I bought, and absolutely exploded from one to hundreds, when I didn't do a water change for about 2 months, and doesn't reproduce/grow nearly as fast when I do weekly water changes. I readily give away those mushrooms to anybody that wants some.) when I go more than a couple of weeks without a water change, although those mushrooms would probably love it.