Hello there and welcome to BYC! 
Crop issues can be tough to treat. You say you brought the last batch home about a month ago? Its possible they are suffering from Coccidiosis. This is very common in birds moved to new homes. Birds become immune to their environment, new birds don't have the time for immunity. Coccidiosis will impact up the intestinal tract or if nothing else, throw it off balance. Crops become slow, diarrhea, they stop eating or drinking. You might run some Corid through them. You can get this at most feed stores. It stops the Coccidia from reproducing by blocking Thiamine absorption. If this doesn't stop the crop issues, Acidified Copper Sulfate can also help. Definitely post in our Emergency section.
Good luck and welcome to our community!

Crop issues can be tough to treat. You say you brought the last batch home about a month ago? Its possible they are suffering from Coccidiosis. This is very common in birds moved to new homes. Birds become immune to their environment, new birds don't have the time for immunity. Coccidiosis will impact up the intestinal tract or if nothing else, throw it off balance. Crops become slow, diarrhea, they stop eating or drinking. You might run some Corid through them. You can get this at most feed stores. It stops the Coccidia from reproducing by blocking Thiamine absorption. If this doesn't stop the crop issues, Acidified Copper Sulfate can also help. Definitely post in our Emergency section.
Good luck and welcome to our community!
