We've been battling this for about 3 weeks now! Our Polish Roo's crop is huge, and feels like a water balloon. He's acting normal with the exception of acting like he's trying to get something up. He eats, his comb and wattles are a nice red. We've isolated him twice trying to fix this... It'll go down some, but not all the way. We've even been able to hold him on his side and get a little of the fluid out at times. Mom thinks its sour crop, but now we're wondering if it could be something else. We tried the 3 day course of Sulmet with no results. Mom Now has Nystatin ordered..... What does this sound like to you?