i had this driftwood soaking to get it waterlogged and ready for the tank, then decided that i needed to sand down some parts to make it safer for the fish. so i let it dry out so i can do that, but when i checked on it a week later it had green and white mold. is this unsafe to use now? even after cleaning and soaking? another issue is, when i soak the driftwood the very tip of it sticks out of the water. so even if i scrub the mold it has a chance of growing back on that spot. any advice is appreciated, thank you.