I do with two of mine but i take them out to feed them seperately in another tank. Im going to seperate them as soon as i move and have space to seperate them
i don't have tanks anymore, but in my racks i have single geckos, 1.1 pairs, 1.2 groups, 1.3 groups, and even a couple of 1.4 groups. i also have female only groups of 2,3, and 4. some of my colonies have been together year round with no issues. others i have to seperate after breeding because the males don't know when to quit, lol
I also keep my geckos in small breeding groups of 1.2 or 1.3 at the most. I try to separate the males for a few months after the breeding season. I also currently have 3 "retired" females living together in a 26 gallon bow front tank.