Originally Posted by mr_X
Adding calcium to a tank without knowing the other parameters is a recipe for a plethora of coral skeletons! Calcium is just one small part of the big picture.
Here is a lot of good reading you may want to skim through before you add any more calcium-
Reef Aquarium Water Chemistry
As for adding chemicals, everything you need is already in your reef grade salt mix. Just do your weekly water changes you're already on your way to a healthy tank.
Frogspawns are not low light. I have one doing very well about 12" from my fixture. It's all a matter of acclimating. I doubt this had anything to do with light.
Thank you for the article.