Q:

So I don't know if my primary is done

I started primary 5 days ago. On the second day it had a healthy yeast cake on top. Day three it began to fall and yesterday, so day 4, it went all the way down. The temp is at 70 degrees and is an ale. The airlock stills bubbles but about once every thirty seconds to a minute. I want to keep it in for at least a week, but after day 7 should I move to secondary fermentation?

A:

Use a hydrometer and take a reading at the same time every day for the next three days. If the reading is the same each time, then fermentation should be done.
Airlocks aren't really a great indicator as far as determining when fermentation is finished, so don't rely entirely on that. Also, Sometimes you may not see much krausen during fermentation, other times it will explode!
The beer will tell you when it's done. I used to let my beer ferment for 5-7 days, but I've got a lemon/citrus wine that has been fermenting for 3 weeks now. If you bottle too soon you'll have bombs!

