A couple quick questions about this substance in reef tanks as I could not find any real good info on it.
1) How do corals use this?
2) How important is this to monitor?
3) What is the benefit of it?
4) How can you raise or decrease and how do you test (just a test kit?)
5) Is it only an important feature if one is to be keeping corals?
and is there any good informative links on the matter?