Ok so i ran across this method of filteration after following a link that was provided for a foam tank divider...
And saw the hamburger mattenfilter...
If you are not familiar with it as i wasnt as well... Its like a sponge filter but more efficient.. Can be setup using one whole side of a tank of you silacone in some tabs in a corner you want one and you slide in the foam matt and it will make a corner hamburger mattenfilter... Of course you would do your measuring of tabs and a little math once you figure out how big you want it...
My question is what do you think as far as using this as like a diy Overflow.. Specially if you have species of fry that could get sucked into a conventional over flow.... I see this being allot better of a overflow for a planted tank as well being less disturbance of the water surface being the water is just soaking threw the foam instead of tumbling down a overflow..
Understand i think t would be less effective for bio cause of the increase in waterflow...