1. Closed-cell foam (the same as for a backpacking mattress) underneath the sump.
2. Closed-cell foam underneath the return pump.
3. Connect the return pump to the pvc pipe with a length of flexible hose.
My Mag 12 return pump has been silent this way for years.
__________________
120 gallon sps/anemones/LPS reef since 2004
Apex controller
8 x 54 watt T5 PowerModule
Herbie's silent overflow system
Jebao DC 12000 return pump
Jecod CP-40 Cross-flow circulation device
Mini Bubble King 180
Barr Aquatics calcium reactor
Bucket fuge
|