Ryan, tunicates are not photosynthetic so they don't need any sort of light. Some say they eat phytoplankton, others say bacteria. Me, I couldn't say either or, but I had a rather large brown one that lived for about a year and a half before a rather angry mantis decieded to go on a rampage over a minnow (mummichog) LOL It was pretty funny, alot of damage done to the tank though. Just watch them closley and try and feed with phyto every once in a while.
lemme know how they do!
Mike