Just added 2 small RG's to my 135 a couple of days ago. They were both out feeding immediately. They are slowly expanding their roaming range from the central large rock formation, which is incredibly honeycombed with holes of the perfect size for them. The fish store guy looked at me like I was crazy for putting 2 in the same tank, but I had read Scott Michael and it sounded possible. So far they seem to hang together much more than they need to if they were trying to establish individual territories. But there is still some aggression, especially if one gets too close to the other when one is in a hole (although neither seem to have claimed any particular hole as their own beyond the one they are in at the time). Not sure where this will lead but it is beautiful to see them swimming together and their interaction is fascinating, as long as it stays relatively peaceful. It would be nice if they turned into a pair, but I am generally planning to add a third, larger individual at some point, per Michael's recommendation. I would have added all three together, but two were all I could find.