I am starting my first nano reef, I just finished cycling and was about to do a water change. I purchase nutri-sea water 4.4 gallon to do a few w/c with . I paid 18 dollars. For some reason I decided to go against the packaging and test the water. The ph was 7.8 and the specific gravity sent the needle straight to the top of my hydrometer. I called my LFS and they gave me a new 1. I'm just trying to warn every b4 u try it, test it