I check my levels every morning and dose b ionic and magnesium as needed. I know alot of guys who have super stable systems with calc reactors who check their levels once a week to make sure everything is functioning properly, but i think if you are using a two part calc + alk everyday its important to check the levels and adjust the dosage, as your corals grow the demand for calcium grows so what may have been sufficient three months ago might not be enough to keep your levels stable now. I do small waterchanges every other day (5 gal on a 65g tank) its prolly more than i need to, but I like to feed my corals (im a firm believer in high import/export) and i feel better knowing that fresh water is constantly being added so that phosphates dont become an issue.
I dose
brightwells reef biofuel (vodka substitute) once a day in the a.m. and add a drop of mb7 (bacteria) every other day after water change.
I add 1 capful of kent essential elements every two weeks
I add amino acids once a week
I feed my corals and 5 small fish once a day when the lights go out: 1/2 cube hikari mega marine frozen mixed with 5 ml oyster magnifique, 1/16 tsp coral frenzy (rotifers, freeze dried phyto, salmon roe, oyster eggs), 1 drop of kent pro series zoomax (cyclops).
just in case you want to check my credentials: kept aquariums my whole life, set up my first reef tank in 1998, worked at eddies aquarium in albany while in school (most of my coworkers now work at the state aquarium in florida), and Ive set up around 12 reef tanks for friends