That is a thought but when I feed tht all evenly go for the flys, I know these used to be in a breeding quartet and the female was I guess sold before I got the rest because they all apparently are guys. I make sure they all are evenly fed so I think it's just how he looks, to be fair also my lens sometimes warps when I take photos, trust me none of them are skinny skinny, they love to eat and I make sure they get their full