I dose calcium 3 times a week. I used kalk to maintain levels for quite some time but found the seachem reef calcium maintains the calcium level just as good and is much easier to use. It is some type of polygluconate calcium that supposedly dosent deplete alk or mess with ph. I use it twice a week and then the reef complete once a week since it has mag and stronium and everything seems to balance out. Are other calcium additives much better like the two part B-ionic?