I brewed my first batch with a liquid yeast starter (California strain). I'm brewing a session ipa so it has a pretty low gravity to begin with. The first few days my airlock was almost whistling there was so much activity. Then it stopped completely after like 3 or 4 days. I know the yeast can still clean up some by products and stuff. Can I rack to a secondary now? (its been a week and a half) I haven't had activity in a week...