If the noise is being produced by the return nozzles sucking air at the surface, could you not simply extend them down another couple inches beneath the surface? As long as you drill a tiny hole in each one just at the surface, to break the siphon in case of a power outage, it wouldn't impact the water level in the sump at all.
I like the simple addition of the power-metering equipment as well; I have toyed with the idea of using similar, but then my wife would also be able to see how much electricity my hobby consumes and that would be a bad thing...
I'm looking forward to seeing the progress of this tank.
I had not thought of just drilling a hole on top of the outlet nozzle. That may be the easiest fix I think.
The longer it has been set up, the more I am just getting used to it and it’s not annoying me that much anymore though aswell.
Gotta keep the Mrs in the dark on both the power usage and general cost of everything.
I find if I shave off about 30% of the cost she thinks that it a reasonable price
