Hello, a week or so ago i got a veiled from my friend and he was very sweet and walked over my shoulders and liked to walk around my room. But i was keeping him in a 20 gallon tank with few things until the sreen cage i ordered came in. And it came in yesterday and after he spent about a day in the cage and bought a lot of vines and branches, i tried to take him out the next day and he would not leave his vines, he hissed at me and opened his mouth and i've never seen him do this before. Does this mean he likes his cage? Will he get nicer after he gets more used to the cage?