I rescued a Syrian hamster that was one year old it was in one of them toy cages with a tube and a dome for probably its whole life it's super small cage so I bought it a 40 gallon tank and redid everything gave him a big wheel but when I took the dome he got very upset started scratching a glass which he had never done so I put the dome back and he is in it all the time pretty much 24/7 he does not utilize the cage like I said he was in a small cage for one year I took the bubble out and he got upset so I put it back in I don't know if I should keep it I never take it out if I do take it out will he just adapt by himself