No tours necessary in Chaltén, unless you're utterly helpless away from any city street. All the trailheads are easily walking distance from town. Do you mean the town of Perito Moreno, Parque Nacional Perito Moreno, or Glaciar Perito Moreno?
Thanks for the reply! I was thinking about the glacier. From what i understand the easiest/and cheapest way to get there is by bus from the station. I suppose this is to simply not go with a tour company which is fine. And then you just enter the viewing spots freely? For activities around the glacier i was thinking about either boat closing up to the actual glacier or an ice walking tour. This is if they are worth it. I have heard they can be costly.