what's the difference whether they are cohabbed with garters or with other natrix? Whether the cage has 3 garters or 2 garters and 1 natrix....Either way you are still co-habbing snakes... so the point of adding another viv or not adding another viv is an invalid point unless you are going to separate EVERY single one of your snakes into a separate enclosure. They have the same care requirements so I see no reason not to as long as there is adequate space for everyone... I have kept baby natrix and thamnophis together in small groups, just as I have kept small groups of nerodia and thamnophis. Both natrix natrix and natrix tesselata. Not for space reasons seeing as over a third of my snakeroom is currently empty tubs and cages....but for reasons of "monkey see, monkey do" (we all know how these snakes see another eating and get "jealous" and it WORKS) Same habits, same feeding regimen.... it's incredible how similar they are when they are from two entirely separate continents. baby natrix can be downright shy at first though and take a bit longer to gain confidence. Being with a few confident young thams seemed to take that away much quicker. The main difference is that natrix get bigger so in the long run.... they will need to be kept separately from the garters. My year old natrix male is a downright beast of a snake and has lost that baby natrix shyness that they tend to have... he smooshes his little face up against his tub (he lives alone) when I walk into the room and opens his mouth and smears his tongue and saliva onto the wall!! That's how much of a beggar he is! I really look forward to when all of my others are doing that!