I just got home with a Large Acropora from a well known reef store, I don't want to mention by name, but most on this forum have been there. When I got home I checked the Alkalinity of the water in the bag, I like to compare theirs to mine. I didn't check salinity. It was 4.5 DKH with my Hanna Checker. I called the owner to ask him what he thought. He told me that Alkalinity doesn't matter only salinity and temp. I don't agree with that but hopefully it survives.