stevethatsmyname:
Hi there! It is too bad that you abandoned this! I was about to suggest getting a BRIGHT backlight for the waterfall, possibly combined with food coloring as others suggested. This gives you a large amount of CONTRAST between the water and whatever is the 'background'... this is what makes an image great is the contrast.Also once you get your light all setup, try testing it at night... wow that would be COOL!
Get some fluorescein and lots of UV LEDs: http://www.ebay.com/itm/310503714340