What kind of salt mix are you using?
As of now I am using Instant ocean salt mix and dose reef fusion.
So far the seachem reef fusion alk and Ca does the trick for me.
I did a search before I bought it and got it cheaper than the ESV 2 part.
The 2 products seem to have some other trace minerals in them.
Danielle uses the ESV on her tank. i just opted for the seachem as it turned out cheaper than ESV.
about the frogspawn, it could be a simple as flow issue. try placing the coral elsewhere. from the pics, looks like its getting full blast right to the mouth.