Thank you. he is okay now. It seems greens changed his colour and texture. now changed his diet to veggies , pellets and seedmix. he is good nowHave you changed his diet? My cockatiels poop will change a little when trying a different pellet of if they decide to eat a lot of veggies. Has something changed with regards to his care that might cause stress? Got an Avian net nearby just in case? Cockatiels/parrots often try for as long as they can to remain "normal" even when sick. This is to avoid looking weak to predators.