Instant Ocean Reef Crystals. No particular reason beyond reviews and cost. I'm also very much a novice so I'd be interested to know if there's a better salt to provide the Ca/Mg and trace elements in sufficient quantities/ratios for a reef aquarium.
Wrightsville beach in last tank. Started this tank with regular instant ocean since its 50bux in coastal and always available in town. Started getting heavily acro based went reef crystals online. Notice great PE after water changes. Alk runs 8.2 8.3. Calc 440. Coral seems happy there