Boiling it will do it....so will a bleach dip....so will putting it in the oven for 15 minutes, (stinks though). Boiling is a preferred method for me as there are no chemicals involved and it seems to clean up the rocks as they boil. Bleach dip will work, but you'll have to wait as the algea die/decompose in your tank water. I'd go with boiling, it's easy and gets the job done.
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