I have a marineland 5 galllon bow front that has been sitting outside for months. This was given to me used and now I am finally gona set it up. My question is about the bio-wheel being dried out and then the tank collected rain water and then froze with the wheel laying in the ice. Would there still be anything alive on it that could hurt my fish? Or can I just drop it in and not worry about it? Oh and its been below freezing here for weeks.