Hi I have two Pekins about 2 years old and a Mallard that has recently started flying away during the day and coming back to the duck house every evening. One of my Pekins has recently started to have explosive loose stools. I only feed them some duck pellets at night to bring them into the duck house at night. Otherwise they have acres and a huge pond to feed on. I am worried about my gal's health and also I am about the have 3 runners introduced to our mini farm and want to keep them well. Any advice?

