Abs help?

Hello fellow ask-scooby-ers! I've asked a few questions on this site before and all of you that have answered my questions and helped me, i cant thank you enough, this is by far one of the best, if not, the best forum for fitness. Today however, i have another question. I need some help getting my abs to be more visible, so my question is, is it more fat that i have to lose, or more muscle that i need to gain? I am 5 foot 8, i weigh 133 pounds, i am pretty skinny, and in the mirror you can see my upper two abs and sort of a one big  "ab muscle" if you will. I run everyday except for 1 day rest at a very fast pace( Around a 6:30 or 6:40 mile) for around 25 minutes and throughout the day i also play soccer in my backyard, etc. Some days i do ab workouts. And i just need to know if i should do more cardio to burn off more of the fat or if i need to get my ab muscles bigger. Thanks guys!