I am trying a 5 gallon bucket of juice from Papagni Fruit Co. Its a Cabernet Sauvignon. I picked it up and it was cold, took it home and left it out. Next morning Sg was 1.090 then I added the yeast. Primary was in the bucket it came with and I didn't use the air lock. after 1 day I checked the SG and it was 1.060, one more day check it again and it was 1.015. I thought it was moving very fast. On the 5th day in the primary I check SG and it was 1.000, so I siphon to the secondary (carboy). Checked SG again today and it was .998. My question is it going to fast and when should I rack and add the yeast killer?