I am in the middle of coloring some MMF and don't have enough of my americolor gel paste can I possibly use my candy color? Or will it affect the fondant I need to color quite a bit so I don't want to ruin a whole batch. Any help would be appreciated thanks.

Gel paste colors are water-based, whereas candy colors are oil-based. I think you'd be taking a big chance if you used them in your fondant. On the other hand, I always add quite a bit of shortening to my fondant - as well as some CMC and a little extra powdered sugar (I do this because of the heat and humidity where I live), so if the colors make your fondant too oily, you could try adding the other two ingredients to balance the oil out. Why don't you try it with a small piece of your fondant to see what happens?