For aquariums from 125 to 250 gallonsThe Turboflotor 1000 Hang On can either be hung on the back of the tank or the sumpIn the hang on mode, only the venturi pump is placed in the aquarium itselfIncludes a venturi pump with needle wheel, the skimmer itself with a conical foam cup with lid and and 2 outflow boxes for directing the outlet back to the aquarium.User Manual (pdf file in new window)