Kalkwasser (calcium hydroxide) dosed drop by drop over several hours is a great way. My tank is only a 24g, so I haven't bothered with it (a 5 gallon water change ever week or so isn't a big deal) but dosing kalk
extremely slowly is a good way to raise both pH and calcium.
When I say slowly, I mean slowly. pH shock will kill your fish if you just dump the stuff in.
I just dose instant ocean reef accelerator in addition to regular water changes, and I've been giving away pieces of montipora for months now.