What is your current setup? Do you already have an exhaust fan(back) and blowhole fan(top)? If you already have an intake fan(front) I wouldn't worry about putting a fan in the 5.25" bays. Your best bet is to exhaust more hot air and in return it will pull more air in.
More fans is not always necessarily better, it is more important to have proper airflow. If you add a fan that disrupts the path to the exhausts, you can create "hot pockets" in certain areas. Your temps already look pretty good.
Yeah i have both a top and exhaust fan i was just thinking that the more fans the better. My cpu idles at about 28-30c and gpu idle in sli about 30-34c.. thanks for the recommendations!
Those temps are perfectly fine. You can't really have to much air, but at a point it is just a waste. More fans equal more noise as well. In SLI sometimes it is not a bad idea to have a fan blowing between the cards to keep air moving so the bottom card does not heat up the top card. If there is adequate spacing it is sometimes not needed. Just check load temps and if they are way off you can plug more fans in. If all temps are fine, I wouldn't worry about it. CPU's and GPU's can run pretty hot and do so by design. If you are overclocking keeping it cool can help with squeezing more out of it, but that is about it.