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call the vet! hey can give you antibiotics to mix in the water. Also, try about 1 teaspoon hard boiled egg all crumbled up over the food. I heard that's supposed to help with bird diarrhea

First thing is what are you feed your birds? Some people just feed there birds what ever they what and do not understand that some foods can be deadly to them. So you should look at what your feeding them first and do not feed them any table scrapes until you get his health back in order, then ask you avian vet ( not a reg vet) about your birds proper diet

It can be treated with antibiotics like Tetracycline for 45 days. The medicine can be given orally or mixed with food. You need to see an avian vet for treatment.