My tank is in my living room and like it quiet (although I do like the sound of trickling water - not so much in this situation).
Having said that, I like to stick my ear next to the internal overflow to hear the trickle of the second drain...that's for the folks running Herbie, and, let's me know the flow is as I prefer it ;-). Not too much it's sucking in air, but a little trickle.
Having said that, I like to stick my ear next to the internal overflow to hear the trickle of the second drain...that's for the folks running Herbie, and, let's me know the flow is as I prefer it ;-). Not too much it's sucking in air, but a little trickle.