Check it out with the tank lights out at night, it may be a little more swollen then, maybe not. See if it has any of its feeding tenticles out. I agree with everyone here and that for the most part they look just how your pic is. Don't know why it is not puffed up for you now if it has always been swollen since June, but like said they do inflate and deflate sometimes, give it some time and see what happens.