So I just started my tank. I've been using the API Saltwater kit to test while waiting for the maven to come out. I'm at the point I want to start dosing alk and calc. But I need to test. I hastly got the alkalinity Hanna checker and have no way to test for calcium. So do I just order half a dozen checkers or is there a "cheap" and accurate way to get me through until the maven arrives?