My Coopers lager (DIY beer kit) has been fermenting for 6 days and following the instructions I have tested the gravity reading which has come in at 1.019 which is a bit higher than I was hoping (it started at 1.039). I have had to brew at a slightly lower temperature (generally between 15.5-17.5 degrees) so understand (from what I have read on several forums) that primary fermentation can take longer, even though I do think 6 days can't be enough time anyway. Should I take another reading tomorrow to check that the gravity readings are in fact still dropping or just leave it for a few more days? Am I right in thinking that fermenting at a minimum of 15 degrees will still work (just longer)? Like other newbies I'm probably worrying about nothing - well I hope so anyway!