Originally Posted by BOBTHEukBREWER
As I do not have glass carboys (I use plastic buckets with lids) I am transferring beer after 7 days fermentation to glass 1 gallon demijohns with rubber bungs and airlocks.
I agree with the previous posters that there's no need to add more yeast. But there's also no need to transfer from the bucket at one week. If the beer isn't done fermenting then you're doing damage to the finished product by not letting it finish out in the primary.
Why are you transferring at one week? Are you worried about oxygen because of the plastic bucket? If that's the case, there's no worry unless you're going to age the beer for more than a month or so. The plastic should be fine for 2-4 weeks at least. The secondary is completely unecessary for most beers.