Easiest way to cycle a tank quickly is by using live plants. Get a bunch of java moss or najas and throw it in the tank. There are beneficial bacteria on all parts of the plants. In addition, the plants will take up ammonia, nitrite, and nitrate right from the water. I have cycled many tanks quickly using this method. I once came home from an aquarium society auction with a stingray. Had no tank set up. Put water and dechlorinator in a 50 breeder, added plants, added a new filter and heater, then added the ray. I have done the same thing with discus and lots of other fish. It works. I could never understand why people go through fishless cycles that take weeks to complete.