another calcium problem

[Otty]

Throw away those test strips and get some real test kits. Strips are ok for freshwater but no saltwater. Your dKH is fine, I run mine around 14 but unless you get your Mg up then you are going to have problems.

[Tight Lipped]

My store is closed this we so I have to wai a few days to get a magnesium test kit.

[amcarrig]

I'm thinking a low magnesium level is the root of your problem. Your alk is forcing your calcium down because there isn't enough magnesium to act as an emulsifier between them.