I got 125 lbs of Marco Rocks and cooked it with water and white vinegar w/ 2 power heads for about 3 days. then I swished each rock in a bucket of RODI. I am building my reef with them now. After I put them in the tank... I expect to have to skim for awhile and run the phosban reactor before the tank will be ready for fish.
I don't think you should take a chance on putting them in your established tank without taking serious care to make sure they are safe.
Maybe cook them for a couple weeks with frrequent water changes and then seed them in the bucket with your live rock before adding them to your tank.
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