I was going to suggest the Red Sea Nano, but I think it's the same as the Azoo Palm filter. I actually have an AC20 on a 2.5, but it's a little strong without a baffle. If you do go the HOB route, the Fluval Edge pre-filter sponge is a nice, small sponge to cover your intake. You could probably use it to make your own sponge filter too.
Last edited by rocksmom; 06-27-2012 at 10:45 PM.