Thanks! I'm not sure why it comes to this, but I feel like my tank never really gets to the "next level" until it hits "SPS quality." That's when the coralline takes off, the coral colors darken, and everything in general looks much better. For me, it was a combination of the lights (probably fixed the colors) and the calcium/alkalinity dosing (consistently, and probably got the growth to take off).
I think there are a lot of ways to make the cube work, this just happened to work for me. My 24g ended up being pretty hopeless
