5 feet long by 2ft wide by 18inches high for the sump and the refugium sits on top of the sump and is like a cube tank really nice you can actually use it as a tank has top bracing and all meant to hold water all the way and that measures 29inches long by 22 inches deep by 15 inches high like a big cube tank all acrylic build bydans aquaplex so its built quality!!!!