Do I use conditioner after I co-wash?
Personally, I do. I cleanse my hair with a cheaper conditioner - Vo5 Moisture Milk - and then I condition with another conditioner. Although, I have heard that some naturals just use the same conditioner twice with that goal, or just go through their hair the one time. It's probably based on personal preference.
I do the same as DomiCurls. I wash with a cheap thin conditioner that would not be moisturizing enough for my dry ends. Then I use something richer like Shea Moisture (avoiding the roots) after that. This works well for my fine 2c colored hair.