Thanks everyone!
30g is just about small enough where it may be more cost effective and not too much of a hassle to dose and not use a Ca reactor.
Here's how I maintain the water parameters... in addition to 10-20% water changes 2x/month with Tropic Marine salt, I dose trace elements, iodin/iodide and aminos daily. I maintain Ca between 420-450ppm and dKH at 9-11. I dose Calcium and Strontium daily. In addition, I add Reef Advantage Calcium to top-up water 2x/wk and Reef Builder 4-5x/wk.
My sump has a fuge compartment with thriving macroalgae and a healthy pod and mysis population. Fuge is set on a reverse photoperiod . My latest addition was an AquaC Urchin in-sump skimmer... sps are loving it! The hang-on equivalent would be the AquaC Remora.
And I use Rowaphos and Seachem SeaGel as well.