I've just upgraded my aquarium from a 125l to a 215l, and the new one has glass ledges about 3 inches below the top of the tank about 1.5 inches wide, front and back - what on earth are they for? Is there a practical use? I have couple of ideas:
- Water line indicator (seems a bit extreme given that a printed/stuck on line would do)
- For hanging things from - what?
- Just to strengthen the glass
- or something I haven't even considered!!??