Even just a few pounds of nice, clean, crusty purple live rock sets the tank off to a great path. My new tank is less than a month old and I currently have a duncan garden, many zoas, and some chalice that look good so far. Just keep corals that can sustain unbalanced pH if you do not have a system that constantly monitors it like an apex or hydros. A fuge using some Chaeto from a reputable source can also supplement more than just nutrient control in an early tank. The algae will also be full of microfauna like copepods and amphipods. Algae barn and Reef Nutrition are great sources of these copepods as well. Absolutely essential in a new system to ensure that all levels of the ecosystem are filled.
Bacteria -> Pods -> CUC -> Coral -> fish. Or something like that.
My current system started with 10 lbs of real ocean rock and 65 pounds of dead rock that I bleached cured. The only area where I got any diatoms was the sand. Those went away and were replaced by GHA. The addition of a dozen snails took care of all of that algae. Now the rock is left bare to be encrusted by the coralline from the ocean rock as well as the new corals.
IMO, most marco and manmade rock has phosphates that leach out early on and cause a lot of uglies. This is why most of my rock was dead rock from a tank breakdown on FB marketplace. I think that all the phosphates leached out over the ~2 years that the rocks were in the system. Then dried out, then bleached to create a true inert reef dry rock ready to be colonized.