Water Chemistry

The other night I noticed the bubble trap in my sump was red?! Closer examination revealed it was completely lined with little tube worms with red gills extended. Doesn't show up well, but here's the best photo I could get.

Does anyone know how much I need to use to raise the Ca in a 50 Gal system by 50ppm? The directions on the bottle only say to use up to 5ml per 50 gal per day, but don't say what the result is.

I started paying much closer attention to my tank parameters since I added an SPS a few weeks back. It's doing well and showing noticable growth. But my kalk top off isn't keeping up with Calcium demand since I started dosing baking soda to keep my Alk up at 8.0 or higher. I'll ...