Child support

I have been paying child support for seven years. My daughter had always lived with her mom. Well, about a year ago my ex(we were never married)left my daughter with me saying she couldn't take care of her anymore; was moving out of state; and asked me to take care of her. I then filed a petition for Child support modification and the child support court stopped the child support. Then the ex came back a couple of months ago and wants our daughter back (I guess since the money stopped). I'm in the process of filing for Child custody now.
My question is: Can I file for child support since my daughter lives with me now?