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Technically, lanthanum chloride removes dissolved phosphate. It forms a precipitate (lanthanum phosphate) that's probably best removed from the tank, since it seems to cause problems for a few organisms (typically tangs), and might manage to dissociate at some point. Lowering the phosphate level in a tank slowly seems to be a good idea, since people have reported problems with sudden large changes in dissolved nutrient levels, although I'm not sure what exactly might be happening.
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Jonathan Bertoni
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