Hi! I didn't know where else to post this but here goes nothin'. So, pretty recently, I got a duckling. She's an indian runner duckling who's only a little less than a month old. About 3 days ago, I noticed she had white crust around her eyes. She was also sneezing. I looked around on google for solutions and I only found 3 options-- Taking her to the vet, Giving her a saline treatment, and putting a bit of apple cider vinegar in her water. I'm too broke for the vet, but the other two options have worked fine. She still has eye crust and she hasn't sneezed once since. Any ideas on what this could be? What should I do?