Drilled tank tank q's

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Undertheradar

Feeder Fish
MFK Member
Mar 22, 2011
154
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oxford england
Hi I'm after some help in grasping the actual plumbing side/ operation of a drilled tank set up. I have been searching for days but most threads seem to be the overflow box type.
My 7ftx2ftx2ft is just finnished being built with 4ft sump. I have had two weirs put in place as was told this would be better later on in life for a marine set up. This were I need guidance the water flows over comb into the sump though bio mech filtration thou refuge and back into tank by return pump. How does the water get back to tank??? Is there a twin port on drilled hole or have I got put additional piping in place. With this would a hole need to be drilled in return or checki valve. All help is greatly received thanks in advance
 
Some one must have the set up and willing to release the knowledge
 
No pics of yet as don't pick tank until sat. I think it a 63mm hole x2. Have seen pics showing a return high up in the chamber with a suction low level
 
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