I need to know how to keep bio-wheels alive while my friend has her tank torn down and rebuilt. I just plopped her two wheels into my tank (her tank is disease-free and clean), but one sank strait to the bottom. Can the bacteria live down there without access to any air? I just assumed that air was needed since the biowheels are exposed to both air and aquarium water when they are running in the filters.
Also, if after two weeks I just yank her biowheels out of the tank, could it potentially send my tank into a mini-cycle since it has gotten used to the extra wheels in there?
Last of all, what is the best way to transfer them back to her tank when she's ready for them - they will have to travel about a half hour? We just put them in a bucket of aquarium water for the ride over to my house. The water came about half way up the wheels, so they were in half water, half air.