It's a combination of the lighting, co-culturing (phyto in the tank), and the mass amounts of reddish orange Formula One I'm feeding them. I syphon the uneaten food off the bottom at least once a day, usually twice, and top off with water from the parent tank, which usually has a slight yellow ting to it, it's a 2 year old tank. Mostly green phyto in the water, and lighting.
I wish it looked as clear as everyone elses I see, but it doesn't. In the video, I had just fed BBS and Form ula One (powdered) so it isn't indicative of the color all of the time. It's also shot lengthwise through the tank, so there is about 15" of water between the camera and fish (the underwater shots anyways).
Jason