We recently purchased a JBJ 45 Gallon saltwater aquarium. The pet store sold us live rocks for the decoration/fish nooks/good bacteria. But they also sold us tinier live rock and instructed us to use them in the filter instead of the carbon pieces. This doesn't sound right. I've looked all around online and haven't found any references to this. Is this correct or our we mistake?
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Live rocks in the filter of my JBJ 45 gl. Saltwater aquarium?