CoralVue Technology BH-1000 Octopus with External 1000 Pump for Aquarium Filter, 100-Gallon
The bh-1000 is a unique design hang on back skimmer in that the pump is mounted external and under the actual skimmer body allowing for much less room needed behind the aquarium. Also by placing the pump outside the skimmer and the aquarium there is no heat exchanged to the water. This design also allows for easy removal of the pump for cleaning and maintenance.