So recently I have gotten a BGK and at first he wanted to explore, but I had a tank bully that I gave to a friend yesterday. Ever since the first day I got him He has either been hiding behind my tank's filter or right near my heater. I am concerned that he is not eating and I don't want him to die. All I am wondering is if this is normal or not? I know the BGK are shy at first but I always thought they hid at the bottom of tanks not the top. My tank has lots of hiding spots so this doesn't make sense to me. What should I do?