Have a look at the following website. Would be interetsed in what people thing of the product and if it really would be as good as they make out.

www.miraclekoifood.com/aquarium_filters.html

Looks pretty interesting but remember "If something seems to good to be true it probably is"

Its just an undergravel filter that goes edge to edge. I think some of the claims are a bit outlandish-i cant believe that gravel is that clear with no other filtration, but if anyone uses or has used it i would be interested to hear the results.

I agree just the under gravel filter most likely wouldent do it,with some little fish maybe it would work but with the O that lives in my tank i garentee he would make a mess of it in no time ....but if it works let me know cause ill order one right now.