That case has 3 120mm fans, so you *should* be ok. There is another fan bay that you can use that requires the removal of the upper 3.5in bays. If you don't need the bay you can easily invest in another 120 to go in the front. I would suggest that you do add another fan, but you can probably get away without it. Just watch your temps!
I like to have air flow directly over my HDDs. It makes them run cooler and last longer. Raptors generate lots of heat. Case temps are important but you have to keep the individual components cool. A well placed fan is better than several indirect fans.