Tank divider
The Mattenfilter need not necessarily be pushed towards the side or into a corner. The
Poret® foam sheet can also serve as a tank divider with filtration function, if the water is pumped from one side to the other. This can be done with the
Jetlifters™, which can also be stuck into the foam by drilling holes. In that case, I recommend to use two
Jetlifters™ so that water can be pumped into both compartments. Obviously, very long tanks such as 33L (48x12x12″) can be divided into multiple spaces, perfect for
Betta breeding, fry raising, separation of aggressive partners, etc. In such cases, a small water pump (~30-50 gal/h) placed into one end and discharging the water at the other end, creates a huge filter.
from
http://www.swisstropicals.com/library/mattenfilter/ (Scroll all the way down.)