Need some ideas how to plumb 500gal

Lucas&kim

Plecostomus
MFK Member
May 7, 2016
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I have a custom 500 gal aquarium with 8 holes already drilled in the bottom of the tank. 4 holes are in the built in overflow and the other 4 holes are in the display portion.
The 4 holes in the display are 1"
The overflow has two 1" and two 3/4 holes.
I'm assuming this tank was built custom for saltwater. The problem I'm running into is I wanna use the overflow as the only drain, but I can't get enough turnover.
 

TRENT

Candiru
MFK Member
Nov 18, 2007
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OREGON
Personally I would cap off the 4 holes in the display area. Put sand over it and you'll never notice. Then use the holes in the overflow box for return and drain.
 

Niners4952

Candiru
MFK Member
Jan 17, 2016
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Still hard to see where the holes are in pic 3 add another pic farther away with tank in same position
 
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