I have a question regarding two part. I recently added my first corals to my system and my Alk (8) is staying where I want it with weekly water changes, however, I noticed this morning my Cal dropped to 380ppm. I try to keep it at 440ppm. I added the recommended amount of Part A (Cal, Mag, Stro mix) to equal out to 440ppm (I'm waiting 4 hours to retest), but I'd like to know if that is ok to do without adding the Part B (Alk)? I don't want to raise my Alk much higher. I am using Continnum Reef Sculpture until it runs out. TIA