Thanks for the reply and information. I discovered they are pretty hard to diagnose on many previous trips to the vets where they seemed rather clueless. I cant say I use any of those products to be honest, there may be the odd use of air freshener which I guess isnt great, but no more than I ever have in his life. There were no fecal changes whatsoever. I also have a maroon bellied conya who is perfectly well, although I am hoping theres nothing in the air! Ive disinfected the cage, although to be honest I will probably refrain from using it again. I suppose itll have to remain a mystery, though a great shame.