Put one of your dirty socks in it...that should have enough bacteria. But on second thought, you want beneficial bacteria not deadly bacteria. Just put the new filter on your frontosa tank about two weeks or more your choice. This will give the bacteria a chance to colonize the filter media (ceramic rings, bio balls, sponges ect..) Plus to really help. Like Blair says take one of your pantyhose. Fill it with some substrate from an established tank and put it in the new tank too. You can also put it in the new filter too...to cut the time of cycling a new tank or new filter. Oh, the joy of setting up another tank...then another and.....