Well I've checked him out a couple of times before I bought him and he was never on the glass just the floor. But now that I've taken him home and set his cage up all water he just won't stop swimming but when he dose he sits on the glass not the island. I guess he just wasn't happy just think all he had was a 5.5 gallon with a wet paper towel and a tiny water bowl that he could barley fit in. That's why I took the gamble and took him home.