Grab a bag of M&M's, tear the package open and spread them all out on a table. We sorted the candy by colors but you can mix them up for a different variation!
We used a cylinder glass as the surface of our waterfall. Take your glue gun and put a dab of glue on the glass to hold a single M&M. Continue the process until you are satisfied with the amount of M&M's being used for the experiment.
Fill a fish tank with water. Remember not to fill it all the way to the top since you still have to put in the M&M's in the tank too. Once you place the M&M's in the water the experiment starts instantaneously!