You can increase the standpip size but its still restricted to the size of the bulkhead. The code is 1/4 inch dropper foot of run. Are you sure it's the drain not being able to handle the flow or is it a water can't get into the overflow issue. I had my teeth for the overflow too small and couldn't keep up.
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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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