I have a 1.3, but once I get another rack I'll separate that into a 1.2 and a 0.1, replacing the 0 with a 1 eventually and the 1 to a 2. They're housed separately though, and introduced for breeding. I like 1.2 groups though, but i'll make exceptions at times.
Female fat tail geckos are notorious for losing weight while breeding so I feel it is best to keep them individually to avoid food intimidation and competition.
All of my gecko get their own tanks. I tried grouping 2 females (leo's) together in a 40 gallon breeder and that still wouldn't work, so they all stay separate.