My first batch has been in the fermenter/LBK for 3 weeks and the FG is at a finishing point ( i think ) and taste flat no sweetness to it....but there are still little bubbles on the surface. Is it ok to bottle or do i need to wait? I waited an extra few days to see if the bubbles would dispurse but still the same amount on the surface. Any help or feed back would be highly gratefull.