I wouldn't worry yet. I transferred my veiled to a new enclosure a few weeks ago and it took him a good week to settle and be comfortable enough to eat. Just keep him hydrated and offer fresh feeders every day. At 9 months he will be fine. Also, keep checking your temps to make sure they are settling on the right temps for him. At 9 months you can and should up his basking spot to 90-95. I had realized that my basking spot was too low in the bigger enclosure and once I upped it, he started eating within a day or so.