Parts of AquaSource I can't see?
I know that I've read everything posted in the archives there, except maybe the saltwater stuff, and I've never seen that article.... is there some secret decoder ring that I need?
Just continuing OT for a while longer, why is it that an undergravel filter needs to be cleaned but a Mattenfilter doesn't? Is it that gravity takes the fish poo down to the gravel but the chemical wastes are processed by the mattenfilter? Sounds like you'd still have to gravel vac. What if you replaced the gravel with an appropriately pore sized sponge, you get a bigger area, and possibly a chance to bump the tank turnover up a bit without increasing the flow thru rate. There's probably a reason for the to-the-side flow.
Sounds like a neat idea for the goldfish folks, the fancy ones don't do well in too much current and can choke on gravel which they typically browse through. A bare tank is so ugly, this would allow for some attached plants.... I'll send that link to some folks, if you don't mind.