For me in that situation.... I would go with a thin layer or crushed coral for substrate, absurd amounts of flow in the display and I would dose silicates until I saw a diatom bloom. I think diatom blooms are the future of this hobby every bit as much as cycling a tank. It's the one critter in your sand that'll die out on its own, but not after coating every grain of territory dinos could inhabit and starving them out. Every tank I've owned that had massive flow just seemed to be healthier, grew coralline much faster and I think for that reason, had far less algae and dino issues.