What safe pen markers can I use for my rocks cape?

madreefer2013

New member
I just bought 80lbs of Caribsea SouthSea Rock and I am doing a mock up of my aquascape before my tank arrives. I want to number the rock so I will know how to replicate the aquascape in the tank. What safe pen markers can I use to label the rock?
 
No idea honestly. But my wife and I just took pictures with our phones. Heck. We're on our third tank and I still have pictures of all of our precious scapes!


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