Custom Reef Insert FTD-1 was made by Reef Replicas to fit in a 125 gallon acrylic aquarium 60x18x24. The artificial reef insert measures 52" in length 8" in width 17" in rock height (tallest part) and 19" with the tallest coral in height. The piece was created to leave at least 4" of room on each end for easier maintainence purposes and more swimming room. This piece can be modified to fit most aquariums. The unit pictured breaks down into three pieces to fit access opening in acrylic aquariums.