290G Peninsula Tank

[Scythanith]

I have to agree with sphelps that adding rubber couplers inline between the return pump and the output to the tank, especially before it makes contact with the wall should really help with the noise transfer upstairs.

If you really have no room, which I can understand as it looks pretty tight, then maybe consider cutting an access panel where the return plumbing enters the wall and adding the coupler there.

Other than that, great looking build!