Hello, I just got a purple firefish and he was doing great for the first four days or so, but the past couple of days he's been hiding in this little tunnel in one of the rocks and rarely coming all the way out, just peeking his face out. He comes out to feed, and eats well, but I'm just wondering why he is hiding so much. As of now, he is the only fish in the tank but I will be getting more very soon. Is this normal?


