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Removing brush algae on rocks (not in-tank)

Scorp1us

Members
I have some lively lace rock I'd like to sell but it is covered in green and black brush algae. I need a way to kill it off without damaging the re-sell value of the rock. I'm decommissioning my tanks, selling everything and I'd like to be able to sell the rock too. I have tanks on hand to do it in, it doesn't need to be in the one with fish.
 
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