Each tank section holds 75 gallons of water they stack 3 high and are divided into 1, 2 and 3 sections. (Have a variety please contact for more information) They are manufactured by Dutch Aquarium systems, they are all sponge filter systems. Have been used in a pet store as fishroom display units; could be used for pet store, personal or breeding. Asking $150 per unit or $400 for 3. Please contact for more information.