Well it all sounds good. You have really two courses of action at this point.
Since the others are all acting well, you could boost their internal gut health with probiotics. At this point, all droppings being good and the babies moved, you might not have any other issues. Probiotics simply help build up the good gut bacteria which, by enzymatic action as well as crowding out, help prevent bad bacteria from blooming and protazoa from having as great an effect. Coccidiosis is usually the culprit in babies where you see a spot of blood int he droppings, or even just mucus droppings that are less brown and more heading towards rust colored. It doesn't take blood for there to be coccidiosis - that's a common misconception.
I'd think since the babies are healthy and the premises clean and they're on medicated feed, I'd take this route. I often have successfully if I saw any signs of coccidiosis. (My babies are usually feedstore babies who don't have a really clean start unfortunately. My home-grown babies never have issues.)
The other alternative is to go ahead and treat them for coccidiosis. If you do this, Corid or Sulmet are the way to go. You'll find dosages for them here, or on the bottle. In this case as well, please do probiotic treatment.
For probiotics, if I had my way, I'd use the ones from the feedstore: probios or fastrack are two examples of easily used good probiotics. However sometimes I just don't have them handy. Other alternatives are acidophilus capsules from the grocer/pharmacy/health food store. The ones designed for women for yeast infections are the best because of the combination of bacteria used. You can also use plain yogurt from the grocery store. It's about a teaspoon per adult bird, one teaspoon per about eight to ten chicks, and you can figure out where in between you are. It's not a medicine, so it's not going to hurt them to have a non-exact amount. Obviously even though most of the lactose in yogurt has already been processed out by bacteria, there's still some left so we don't want to have them eat loads and loads.
Moderation is key.
I mix yogurt with crumbles, an egg yolk, and water til it's crumbly and moist. I have few refusals of it.
If you used capsules, just break one on top of about a fourth cup of food. If you use probiotics or fastrack, I just sprinkle it on top - like you'd sprinkle sugar on strawberries.
Just watch that poop. If they're raised up, put papertowels underneath to see the color of the droppings.
Or newspaper or something. You don't HAVE to, but it's a nice tip that helps sometimes.
Oh yeah - and make sure your babies aren't perching on their feeder and pooping in it. (I think this year's babies do all the wrong things like this heheh.) They'll just eat it and you won't know they're doing it, silly things.
I really think you won't have problems now, especially if you just give them probiotics and watch them for any mushy droppings. Especially at this age. They should have pretty nice little firm droppings now with urates obvious on them.
Hope this helps! I'm jealous of your araucanas. I got a mixed batch of bantams this year because my boyfriend is just learning about chickens and it's kind of fun to get a mixed batch and figure out what he likes.
Let us know how they do, please?