Bean animal - not quite silent

[wesb2013]

I set up my tank a few months ago and installed a bean animal style overflow. It has been silent to the point I couldn't even tell if my system was running out not.


During today's water change I adjusted the return pump so that there would be less flow in the main tank. I figured I'd need to adjust my overflow to the new flow rate to make it completely silent again, however after several hours of fine tuning I still haven't got it right.

I know I'm close because it'll go completely silent for a few seconds then start to gurgle for a few seconds of and on. (videos are in the links below) there are no bubbles in the main siphon, and the secondary pipe has just a trickle of water running through it.

What do I need to do to get complete silence again?

I saw another thread where someone suggested to another user to increase the flow rate, would that actually do anything? I'd prefer to keep the flow rate small.

New video by wes bosco

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New video by wes bosco

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[Midwater]

Yes, all three of your pipes are facing up.

I have it so that the siphon and durso are facing down.

The safety overflow is almost redundant, as if the level rises above the dorso vent, that then becomes a second siphon.

Totally silent. Works with any flow. Easy to tune.