well its real easy.
From your overflow run a 1inch pipe. to the sump thats all.
Then from your your sump hook up your pump to a 3/4inch pipe
and run that to your tank. that is the return.
If u have a predrilled tank it will have a 1inch hole and 3/4inch hole on will need a 1inch bulkhead and 3/4inch bulkhead these are used to suppose the hole to pipe threw the glass. Its really up to u kinda look at your tank and draw the best route for both. then figure out what u need for a standard simple setup u dont need vavles and stuff.
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75gal RR Tank with 2 Seio 620 and 2 maxijet 1200, 2 150watt HQI and 2 Antic PC, Turbo Floter Skimmer with 9.5 Mag to tank and fuge, Sump is 75gal with a 22gal fuge, 40gal Auto topoff.
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