I recently took a fairly large piece of driftwood out of my tank and I just set it in a large container, well a about a month later I go to look at it so I can cut it up and use it in other tanks and I notice green on it, it's kinda light not really dark. Driftwood is completly dry.is this mold? I would take a picture but my camera is cracked. Could I just soak it in prime for a while? I really don't wanna throw it away because it was $50..