 adding calcium
I have been adding liquid calcium to my tank by using the wet and dry filter.But today I decided to add the calcium in the tank direct, later today I noticed that the area where I added the calcium the coralline turned white, was that cause by the addition of the calcium? or not.
I also noticed that my small polys didnt open today, they are still closed, was that caused by the liquid calcium also, adding it directly to the tank?
Should I only use the sump to add the additives?
Any advised will be appreciate. thank you in advance, you guys had help me a lot, thanks. | 
