It's precisely what's not in the back of the tank that makes it so low maintenance.
Sand is not my jam, I only put it in here for aesthetics mostly for you guys.
The real answer is that we don't test the water on this tank.
I basically under do everything, that's the feeding of the fish, that's the water changes, our hands in the tank, the lighting schedule, the lighting intensity, everything is just aiming really really low.
There are a lot of unknowns when it comes to reef aquariums, when it comes to corals and we don't always have a really good answer for you.