Instant ocean salt parameter

[mikellini]

Originally Posted by Aquattro

You know what I don't understand? How people had successful reef tanks 8 years ago when Mg didn't exist in the hobby...it's weird.

I don't understand how people had successful reef tanks in the 90's... but they did. Not sure what that has to do with magnesium.

The point of raising magnesium to close to natural sea water levels is to limit the abiotic precipitation of calcium carbonate. You can leave it lower, but you'll have to add much more calcium and carbonates to maintain a given level. Particularly if you're trying to maintain a level of calcium or alkalinity that's higher than natural sea water levels.