Here's 1 pic that closely resembles what I built http://evablis.netants.at/wp-content...05/foto936.jpg
Here's another neat set-up of the HMF I do like, its the same foam, but rather then messing putting it in your corner, its tied together as a circle with the filter heat in the center of it and a outlet http://www.andreasmgross.de/images/0/03/071103ZMF.jpg
As for the flow, many of these set-ups from reputable aquarists suggest a flow rate 2x the tank volume per 1 hrs, for Example 55g tank > 110 gallon/hrs pump.
However all my plants were heavily planted and not nearly overstocked so in my set up I had VERY little flow rate, it kept the water circulated & clean but didn't cause a "wave" in the tank for my plants.
What I found very usable are the little pump's you find in hardware stores that are sold for these little table water fountain set up's. Once I had tested these for my 20 gallon, I then used these only as a pump for the HMF filters.
The reason I like this filter set up so much apart from being cheap & easy, its maintenance free, you never have anything like a hose braking off on your canister and flooding your house, doesn't clog up or is loud like a common HOB. And in all the yrs of usage I never had a singel problem of any type I could report here
Also on the up side, if you use this set up for tanks that also house shrimps: Not only does this enable your shrimp population to grow QUICK (not getting sucked in the commen HOB filters) but they also LOVVVVEEEE the filter mat's for a snack bar, once the filter ran for a while collecting all sorts debris they always been all over mine like a gang of cows out on the pasture lol
The breeders I thankfully got to know while where were overseas, any & all of them use this system ONLY in their tank set up's (we're talking bout guys with fish ROOMs here and like many many many tanks). Just simply cause its such a hassel free system all around. I think that's why it was so popular over there, cause its simple and works.