Not a day goes by where I don't carefully examine the fids' droppings on several occasions. My boyfriend thinks I'm crazy, but I know its necessary!
Here are a few links to help you understand what you're seeing, and what it should and should not look like. I have these saved in my favorites for easy access.
http://www.parrotchronicles.com/sept.../droppings.htm http://www.birds2grow.com/art-poop-ology.html