The end of the 100 gallon reef tank. You can see the length of the Arowana/Redtail Cat tank next to it.
I have 2 corner braces holding it together and if you look at the bottom, you'll see another that is used for lining the top up with the ends of the tank. The front board is 1x10 the ones that go across are 1x8 that leaves room for the top and bottom of the face board to be taller and cover the water line and keep my lights from just falling off the front.