For those interested in why not to do this this fitration, Hoppy graciously started a thread on the pros and cons of the filter. In fact, I encourage you to go there and decided for yourself and even join in on the conversation. http://www.plantedtank.net/forums/lo...r-why-not.html
Driftwoodhunter, this is going to be fore a shrimp and small fish tank, specifically a 33 gallon long. I toyed between a sump, a canister, a powerhead, a basic sponge filter and other ideas on filtration (even - gasp - undergravel filtration). Seeing my shrimp always on the prefilters and basic sponge filters is what lead me to finding the HMF. This has been around for many decades, longer than my life and is still used today, many purposes being breeding.
I was in between using a sump with a mattenfilter installed there or directly in the tank. After much thought, I am going the traditional route. This was picked for purely the reason that I'll find it pleasing watching shrimp play on the wall. As many already know, shrimp and fish love picking on the goodies growing on sponges. When I took my sponge out to rinse them every few months, I had to practically pull the boogers off them. They bred more frequently in this tank, didn't have to worry about the filter sucking up babies and was the lowest maintained tank I owned. I could focus on the tank's inhabitants.
For me, algae will be expected to grow on this fitration, specifically Cladophora.
However, out of all the algae out there, this is the most pleasing to me and generally is found in pristine water conditions.:
One could run and hide at this point, but even just this sponge is a haven for all kinds of goodies. All throughout the day and night, if the shrimp aren't fed an outside foodsource, they are on this sponge picking away. Babies flock to it. From this image, I imagined a wall of spongecake and the search led me to the old HMF.