Greg's 75g Rebuild

[gregzz4]

Originally Posted by patpare

Couldn't you just add a gate or ball valve?
You have 2 drain lines I would add a valve on one of them!kinda like the Herbie overflow
From what I've read the higher the water falls in your overflow box the noisier it gets.

I have a gate valve on the main drain, just under the tank
Problem I'm finding is, with the design of this overflow setup, the back box sits lower than the front, so the water falling through the weir teeth 'falls' down to the level of the 1-1/2" through-the-glass bulkheads. Unless you run the back box nearly full, you get water falling.

Gate valve see pic #4 on page 1
First few pics also show the difference in height between the front and back boxes