I just bought a Jardini and he was real shy when I put him in the tank, he would swim irratically as if he's perminently scared, it's been about a month now and he still acts the same way he just hides under the drift wood once in a while he would come out and swim but would freak out and go back under the wood. He's about 4 1/2 inches. Is it normal behavior when they are young???