I had chicken and duck eggs in at the same time and kept the humidity at 50 until day 18 for the chicken eggs, than bumped the humidity up to 70. The duck eggs did fine and once the chickens were done hatching I kept the humidity down to around 60-65 and than bumped it back up higher when it was time for duck eggs to hatch. Last weekend I had 19 out of 21 chicks hatch and this past week I had 7 ducklings hatch, am now waiting for my last 3 muscovy duck eggs to hatch sometime next weekend.