We do not use any scented sprays, air fresheners, candles etc.
Yes we took them to an avian vet, we actually located her through the http://www.aav.org/. The first thing we mentioned was the frequency in sneezing and discolored feathers around the cere. He does not vomit and is eating, singing, playing as normal.
From both my own research and posting this on a few other forums, it seems this is likely Vitamin A deficiency. Which often results in stains above the cere, and occasionally increased sneezing because of a weakened respiratory system. http://www.multiscop...ot/vitamina.htm
This makes sense, because they are very stubborn birds and will only eat seeds which are notoriously low in Vitamin A content. In addition, his feet are somewhat pale and discolored another symptom of Vitamin A deficiency. We are in the process of converting them over to Harrisons pellets. Via the websites instructions we started off by introducing bird builder to their water as recommended 3 weeks before beginning the switch. The bird builder formula has iodine and trace elements, not sure if Vitamin A is included or not. Next step will be to start baking some bird bread, we are going to sneak some carrots into the mix as well.