AquaCorner has been specially designed for small aquariums (also for nano-tanks). This corner filter takes up very little space, leaving you plenty of room to design your aquarium. It simply clips onto the edge of the glass. It's so tightly "glued" to the aquarium glass that no animal can get behind it. And its suction has been calculated so that small animals (e.g. young shrimps/fish) are not sucked in. Aquacorner is easy to dismantle. Behind the suction grid is the pre-filtered foam, followed by the Mediabox. The Mediabox can be completely filled with EHEIM filter media