Deborah,
Be careful with the wheel in you ASF tank. They are too busy to chew out because of the wheel, but they also may be too busy to breed. We had a 1.2 group in a tank when we first got them (there was a wheel in there with them). We also had a 1.2 group in a tub,. The group in the tub was on their second litters before we noticed anything in the tank (we had also removed the wheel before we got any action). So, it may be wise to take the wheel out if you want to have any offspring.
Just my two cents.