I'm thinking your coraline dieing off due to low calcium. When I started my tank, and before I was watching my ca/alk levels, the coraline starting dieing when my Ca dipped below 340. Once the coraline starts to take hold, it can suck up a bit of calcium out of the water and your levels will drop.
B-Ionic just maintains existing calcium/alk levels. It's best to raise your Calcium levels with something like TurboCalcium, and then figure out what amount of 2-part solution you need to use to maintain that level. I currently boost my Reef Crystals up to 400-420 ppm and then use 20ml of C-Balance (in a 46g tank) each morning.
Here's a good article for keeping your ca/alk levels balanced as you adjust things up:
http://www.advancedaquarist.com/issues/nov2002/chem.htm