My suggestion is more venting drill multiple small holes and then if you do to many glue or epoxy the in. I used 3/16" drill bits and got like 6 holes in my standpipe.
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360 gallon sps reef, 180 gal sump, bubble king supermarine 300, 4xmp40Wes, 2 x 6215 tunze waveboxes, 4 ghl mitras
360 Reef Tank
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