Why isn't my coraline algae growing!

[lockrookie]

Originally Posted by Timbits

So i just remembered that the rock in the tank, i got it from some guy and he told me that it was from a medicated tank.... or something like that

Would that have anything to do with it??

define medicated.if copper wasusedthrow the rok out nothingwill grow in thetank period corals or coraline