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Blue Tang Clan · 10/23/2018, 06:21 AM

If you already have 1" return holes drilled in the tank, I wouldn't "make them bigger" -- adding another would make the most sense.

You won't get 4000 out of a siphoned 1.5" drain, but it should be plenty. Turnover within the tank (water movement) is often more important than how fast you get water out and back into the tank.

10/23/2018, 06:21 AM	#2
Blue Tang Clan Registered Member Join Date: Nov 2017 Location: Maryland Posts: 51	If you already have 1" return holes drilled in the tank, I wouldn't "make them bigger" -- adding another would make the most sense. You won't get 4000 out of a siphoned 1.5" drain, but it should be plenty. Turnover within the tank (water movement) is often more important than how fast you get water out and back into the tank.