[sunnydyazz]

I'm inclined to think the same way as Jo Ann that it might be a case of AGY. I think Ronidazole if much more effective than metronidazole in treating diarrhea. Is your bird's diarrhea dark green in color? If so, it might be a case of trichomoniasis. It can be treated with Ronidazole (Ronnivet-S) in the water for seven days.
Alternatively, diarrhea can be treated with a mixture of ginger-garlic juice given to birds via dropper.