So, I had driftwood in my tank that I purchased from my LFS about a year ago. I took a break from fishkeeping and all the water evaporated. Then, a bunch of white mold-like thing grew on everything especially the driftwood. I washed my tank out with hot water and a sponge and every growth is gone. I was wondering if I should use this piece of driftwood or not. Is my tank safe for fish?