When I had my Solana, I found an awesome mechanical filtration method. The Marineland Rite Size A pads fit on top of the chamber 2 grate really snugly. They don't move or float, and they are obviously designed to have water flow through them, and there are two little cut outs that would prevent clogging as the water can bypass the full pad in the event of a clog.
You also get the added benefit of chemical filtration as they have activated carbon in them.
They aren't cheap, but I found a 6 pack for $10 on Amazon.
http://www.amazon.com/Marineland-Pe...IFIE/ref=sr_1_1?ie=UTF8&qid=1250499229&sr=8-1
I was changing them every week, but I'm sure you could go a lot longer. I had them in Freshwater application with a much higher level of detritus, and could use them for several weeks. I think every 2 - 3 weeks would be good. That'd a $30 - $40 investment for an entire year's worth of filtration.