I have some 1 gallon demijohns with lager in them they have been in fermentation for about 12 days at 9c and they are bubbling slow , I just want to plan ahead on what to do with this brew , like should i keep them in there primary fermentation to the end ? should i start raising the temperature soon ? when the time is right should i cold crash ? if so can you cold crash in primary ? I have got to this point and just want to know what the next steps are i should take to finishing off the fermentation to bottling .