How long has Ice been displaying this behaviour may I ask?
Is he sleeping more, eyes closed and not as active?
What temperature is the room where he is caged, has he been eating, drinking, normally and what is his poop like? Runny, green, poop is a sign of trouble as is a fluffed up budgie usually . They do not sit fluffed for no reason. An avian vet visit would be the best way to go regarding your little Ice. I hope all is well soon.