It is unheard of that it would cycle completely and be safe for fish with no added filter media or bottled bacteria, because of the nitrification cycle. The beneficial bacteria take weeks to grow into a colony which can process waste. More information will be covered in the article linked below.
There are ways to hasten the process with someone's healthy filter pad which already contains the start of a BB colony and also some bacteria in a bottle products.
There is a fishless cycle and a fish-in cycle. Both are linked in the article above and you can decide which way works best for you.