Rather than a DIY mod to the filter, using the right type of sand can be a much better option. I only use and recommend Estes Marine Sand (aka Stoney River, Ultra Reef, and National Geographic). It doesn't need to be cleaned at all before it goes in, sinks quickly when they mess with it, is the perfect grain size (no toxic gas pockets), and comes in different colors (I usually do half black and half white).
I know a lot of people like the Sun Suns, but you get what you pay for. The ones I have worked with on clients' tanks have all been a pain (to the point where most upgrade to a Fluval). I would go with two AC110s or a Fluval FX4.