Well, you started well by using Ruckus, assuming that's the case. With 2-300 clients density, you shouldn't have too much of a problem with Ruckus APs. As stated by Michael, positioning the APs with a bit of distance in between and ensuring that structures are well defined, as in making sure there are no metal walls, elevators or things of that nature that could cause you issues AND utilizing as few SSIDs as possible is a great way to start.
Ruckus APs are very effective at mitigating interference and are used in some of the highest density environments in the world today. You will be pleasantly surprised as to how well they operate once deployed.