get a tape mesure and mesure the tank
measure it's length wideness and hight.... when you type the dimentions you put the length first, widness second and hight last... like this, it I had a standatd 75 gallon that is 48 inches long 21 inches tall and 18 inches wide I would put the length first(48 inches) widness(front to back) is 18 inches and its talness 21 inches... you wright it like this,... 48x18x21 remember wideness is front to back and hight is how tall it is...
measure it's length wideness and hight.... when you type the dimentions you put the length first, widness second and hight last... like this, it I had a standatd 75 gallon that is 48 inches long 21 inches tall and 18 inches wide I would put the length first(48 inches) widness(front to back) is 18 inches and its talness 21 inches... you wright it like this,... 48x18x21 remember wideness is front to back and hight is how tall it is...