Airline tubing-how you create a siphon is up to you. How far above the tank you raise the outgoing water container helps regulate the water flow. The higher above the tank you raise it, the faster the flow; conversely, as you lower it to tank level (or below) the flow rate slows (or stops).
You can direct the flow onto a piece of hardscape or against the sidewall of the tank/vase to help disperse the force of the water. For my smaller tanks--especially very shallow ones or those with sand- I'll put my thumb over the end and let it just barely dribble out.