I tried a couple of ideas before I hit on using glass strips to support my Atlantis 2 ATS. I got a gazing company 2 make me 2 x 75mm X 10mm glass and had them champer the edges. I then glued 2 white chipboard plastic angle brackets to the strips so they sat inside the glass edges of my sump to prevent them moving back and forth and stopping them slipping into the sump by accident. I am able to move the glass supports lengthways if need be and are also easily removed. [