I found a few adults in the wild, rarely more than two to a large area, so i would suggest that you keep them in pairs, as it also says in Leann and Greg Christenson's book "Day geckos in Captivity". According to the same book they reach a maximum size of 9.4 inches. Quite large. They were found in "dry forest" (very rainy, and high humidity haha) For more information, I would suggest you consult that book, because it is truely a great source of knowledge.