I have three little chickies-- I've had them a week, and I think they were 2-3 days when I got them. One is making runny poo. Not super liquidy, but not as well shaped as the others. I haven't been able to tell which one it is, yet. They have medicated feed. Generally, they all seem happy, healthy, are eating and drinking well, sleeping nicely, and seem all around rather content. Should I be worried?