chrisdef15;1546909; said:
??? Unless it says something that has confused you on the packet i dont get the question? Just do what it says and add the whole packet to 5g of water. Pretty simple.
Pretty simple, but in a different way.
I use the same brand of salt (though the 200gal containers) and the final direction states to TEST SALINITY prior to use (since all marine tanks aren't maintained at the same salinity).
It all depends on what salinity you're shooting for and what the salt mix formulated at. For example, if adding that entire bag of salt mix to 5gal of water creates salt water with a specific gravity of 1.023, it would create a salinity swing (upwards or downwards) if the salinity of the tank in question isn't maintained at 1.023. I maintain my reef tank at 1.027, so any saltwater I replace when doing water changes will be at 1.027. I maintain my puffer tank at 1.022, and so replacement water following a water change is at 1.022.
Ideally, you'd want to add water of a specified specific gravity rather than a general or 'default' one (i.e., "cup per 2gal".)