meaning of target ion

[paris 06]

[FONT=&#48148]Is there any term called "target ion" as below? I am not sure if it itself is just a term or if it has any meaning. [/FONT]
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[FONT=&#48148]- target ion-specific [/FONT][FONT=&#48148]supplementation may be called for in some aquaria[/FONT]
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[FONT=&#48148]Please help me.[/FONT]
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[SoothingDave]

You may need to supplement your aquarium with various ions. You will have a target for each ion. So you have target ion-specific supplementation.