Need help with weir box noise

[ismira]

I’m struggling to dial in my reef tank. I’m a bit confused by the plumbing in the weir box. How do I stop the water trickling noise.

 

[Gumbies R Us]

@Troylee

 

[mfinn]

I’m struggling to dial in my reef tank. I’m a bit confused by the plumbing in the weir box. How do I stop the water trickling noise.

Looks like you have 2 drain lines and 1 return line from the posted pictures.
If you absolutely don't want to move the return line, you have 2 available drains to convert into a herbie drain system.
Google Herbie drains.
You can also Google Bean Animal drain systems if you want a 3 drain system.
The Herbie drain is pretty simple and won't require too many changes.

 

[BryanM]

Usually this comes down to fine tuning the valve, but in practice I've never had a silent overflow box, just a quiet one.

 

[Troylee]

Put a valve on the drain to bring the water level up and it will be dead silent