This tank is a 600x 600x 600 cube made out of 12mm acrylic. The internal dimensions are 575 x 575 x 550 water height giving it a water volume of 180 liters. There is a coast to coast overflow at the back and the back panel is drilled to accommodate a closed loop gyre style. The tank is half built and is the polishing stage. I will upload some pic's later this afternoon.