If it were me, I'd shake the crap out of it in a bucket to catch/save all the iso/amphi/copepods I could and put them straight into my system
Then I'd put the new LR in a tub or bucket with a heater, powerhead and a loose lid (to block light only, not airflow) for weeks while I looked it over for crabs, mojano, aiptasia; monitor it for phosphates and algae; the list goes on
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