I brewed an all-grain APA on Monday. I did a 3 gallon batch and it has been bubbling away in a 5 gallon carboy. I don't have a 3 gallon carboy to use as a secondary for this batch. I'd like to dry hop it with some Cascade. Can I just add hops to the primary once fermentation slows and then bottle after a week or two in the primary, or do I need to acquire a 3 gallon carboy and rack the beer into it over the hops?