I got this from someone else like three years ago and never set it up. I don't imagine I'm going to use it any time soon. $75 or will trade for a light that fits in a 24 gallon tank.
http://www.marinedepot.com/uv_ultraviolet_sterilizers_ozonizers_red_sea_aquazone-ap.html
http://www.marinedepot.com/uv_ultraviolet_sterilizers_ozonizers_red_sea_aquazone-ap.html