Quote:
Originally Posted by asylumdown
Do it in salt water. Phosphate behaves differently in salt vs. freshwater. All the different chemicals in salt water push phosphate to form a different ratio of species, and since you're going to be using the rock in salt water you want it to reach equilibrium in salt water.
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This. Phosphate speciation is affected by pH, and you're better doing this in water close to the tank parameters.
A good quick read here -
http://en.wikipedia.org/wiki/Phosphate