Last night, I noticed my male forbes was sitting on the bottom of the cage...he was hopping around and trying to find seed on the cage bottom. Then he would try to fly back up to his nest (there are at least three eggs he's been sitting on with the hen) and he couldn't make it up. When I caught him, I noticed his bottom had poop smeared and it had an awful smell. I ran some lukewarm water over his bottom to clean him off, put him in a hospital cage with seed, water mixed with probiotics, and some heat. He died this morning

As I was getting ready for work, I noticed my best gouldian hen also has the same foul diarrhea, and she's currently caring for four gouldian babies with the male. I immediately removed her, cleaned everything in the cage and moved her babies to a clean nest, and she's in a hospital cage.
I'm thinking I might have given out a bad batch of egg food or their water went bad. The only thing I currently have on hand is enrotex, nv powder, and probiotics. I don't know what I should get to help my gouldian hen, and anyone else who might show these symptoms. I'm sure I'll need to treat the babies as well. What medications should I order to treat this??? I'm not taking anyone to a vet...I don't have any aviary vets in my area, and I feel competent enough to treat them myself if I just know what to give them. I checked breastbones...it looked like the forbes was losing weight.
Thanks in advance for your help!!!!