Hello, I need help with Gill. He was in a one gallon with filter, no heater cuz I control the temp of my fish room. I now have all 3 betta splendens in a divided ten gallon. I have two females and Gill. He is on the end. He can see them cuz he has black divider. He seemed depressed in the one gallon. I thought maybe he would liven up in the ten. He just wraps himself around his diy filter. Each have their in there section. He eats when I put his food in his face. The water is perfect them. Can they get depressed.