Yup, what Ragin said. I have a smaller freshwater tank, 260G, and have a closed loop circulation. Not the best pictures but to provide visual.
Zoom in on the first picture and you'll see one end with strainer that will suck water. At the other end with loc-lines are the outlets.
Other picture just shows pump in the bottom right and plumbing. Of course you can run the pipes or hose anyway you prefer...this is just an example.
I could have done a better job concealing in the tank, but it doesn't really bother me that it's exposed. HTH.
Zoom in on the first picture and you'll see one end with strainer that will suck water. At the other end with loc-lines are the outlets.
Other picture just shows pump in the bottom right and plumbing. Of course you can run the pipes or hose anyway you prefer...this is just an example.
I could have done a better job concealing in the tank, but it doesn't really bother me that it's exposed. HTH.