It consists of 4- 20 gallon long tank's. Their are acrylic tracks inside the tanks for dividers to slide in as needed to separate fish. They are all plumbed together through a common 40g sump. Tanks have covers to keep fish in and reduce evaporation. Live rock is used for filtration and high powered UV to control pathogens. This pic is during build last weekend, I will take a new one with it finished.