interesting article on saltwater elements.

[byrself]

<a href="http://www.reefkeeping.com/issues/2002-04/rs/feature/index.htm" target="_blank">web page</a>
some interesting results on calcium tests also. check out the graph on the readings of different tests.

 

[nacl-h2o]

Its amazing how much our tank chemistry changes in a short amount of time.