I got a good look at them after I got home for the Academy of Sciences on Sunday.
The color is a darker green than the Nuclear Greens that I have under the Radium 20K 150W bulb. They are closer to a dark tropical green with a few lighter, yellowish speckles. Mine don't have the green on the tendrils like Badbread, those tips are still brownish.
They definitely actively feed, and chomped down on some food in the tank.