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You can put any number of things on the end of the return line. Water flows out of the tank via the overflow, and goes down into the sump. The return pump down in the sump takes the water from the sump, and pumps it back up to the tank. You can get fancy and put something like a seaswirl (a nifty powerhead with a rotating nozzle), or just have an elbow bend and have the PVC just sit right in the tank.
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Jason Nugent
Reefcentral Moderator
"I have heard of a place where humans do battle in a ring of Jello."
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