I have a 3.5gal tank. I am upgrading to a 20H. Can I use anything from the old tank to cycle the new one. The 3.5gal does not have a filter, but could I use the gravel or decorations or even some of the water??? And how would I go about doing that? Before you cycle, you decorate it and hook up all the equipment, right? You cycle the tank exactly like you would want it but without the fish, right?