What is one who use light, and dark side in harmony, as if there were no such thing as seperate sides? I thought it was a grey jedi, but after reading up a little bit, i'v come to think otherwise.

I think Grey jedi is the appropriate term, but I'm not 100% on that. I know there's also the group of thinking that Vergere seemed to go with, that there is no dark/light, just balance. Of course, that's the same lunacy that Alema Rar has been following in the recent books, and she's got it all sorts of messed up.

I didn't know that "grey" jedi were considered to be in harmony with the light/dark sides. I thought they were doing more of a tightrope walk and they could fall to one side or the other. They're still heretical though right?

Oh, whoops, I missed his comment about being in harmony. I'm not sure what it is then. Could be something along the lines of the Potentium that Zonoma Sekot believed in.