I recently had a sick duckling pass. The other duckling seemed fine until the other day when i noticed another one is acting weird like the first one that died. His eyes are closed alot of the time. He barely eats or drinks, and he constantly is rubbing his chest with his beak. I've noticed hes not gaining alot of weight either. I just started them out on Probiotics and Electrolytes in their water.I keep their water and brooder clean, I also got them mealworm treats. Is there anything i can do to help him gain weight and get him back to normal? Help? I dont want to lose another.