The people who come out to clean and do water changes for me once a month just left. They said that my calcium is low as well. So I am going to use B-Ionics or Tech CB where I can raise them at the same time. Try to maintain balance. That you so much for the help! said:
If you decide to use B-Ionic, that is fine. I used it for over 2 years, but remember you dose it daily early in the morning. I wrote about it on this page: http://www.melevsreef.com/chemicals.html
I wouldn't dose buffers to raise and lower pH. If you focus on Alkalinity, Calcium and Magnesium, the pH tends to take care of itself. Of course temperature and salinity are important. The goal ranges are listed at the top of this page: http://www.melevsreef.com/parms.html (Hmm -- I need to do some water tests myself :wink: )
Regarding your leather, keep in mind that about once a month a leather coral will look miserable for about three days. This is the time when it may shed some tissue around its base, which you can siphon out if you wish. After the short duration, the coral should perk up and even exhibit a growth spurt.
If your water quality is off, the coral may look unhappy for a longer period of time. And if you try to solve problems such as phosphates in your tank using an aluminum-based product (Kent's Phosphate Sponge), it can take three weeks or more for the leathers to rebound and look good again.
HTH (hope that helps!)