Look at the Mag Drives. I just replace my return 2 days ago with one of these. It is almost silent, very very quiet!!! They are also very small and epoxy based, so nothing to leak if it ever breaks.
Gold's has the full line. I bought the Model 18 ($200) and it does 1800GPH. My tank is a 180G with 2 overflows into a 105G refuge/sump. I use Durso Standpipes and everything is really nicely balanced. I don't have to regulate any flow with the valves (overflow or return)
They make quite a few smaller models and one larger one (Model 24, does 2400GPH)
I highly recommend, very solid and quiet. My other return OceanRunner 6500 developed into a noisy machine, this is the reason I changed it out. It was under 2 years old, no reason for it, but oh well.
Oh Yeah, the Mag Drives have a 3 year warranty that Dennis @ Gold's supports, so you just take it back to him. That was another selling feature.
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Setup: 180G DT, 105G Refuge (approx. 300lbs LR, 150lbs Aragonite)
Hardware: Super Reef Octopus SSS-3000, Tunze ATO, Mag 18 return, 2x MP40W, 2X Koralia 4's Wavemaker
Lighting: 5ft Hamilton Belize Sun (2x250W MH, 2X80W T5HO)
Type of Aquarium: mixed reef (SPS & LPS) with fish
Dosing: Mg, Ca, Alk
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