Balling method

[FragIt Dan]

Originally Posted by Delphinus

That doesn't make sense ... Only water can evaporate leaving the salts behind which would drive the SG up not down. If your SG is drifting down then something else is going on. Do you skim fairly wet maybe?

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+1, although an undetected leak, or coral uptake of Ca, dKh and Mg would potentially drop the salinity. There was a recent post (I think maybe in TOTM??) about skimming very wet and having to add salt to ATO to make up for it. I'd want to figure out what's going on if I were you though.