Thats alot of GPH for internal.
I myself have used the Mag18 on my 180gallon display and 100gallon sump without issue. Approx 1800GPH at 0 head.
Also now using an eheim 1262, again works just fine. This pump is less in GPH than the Mag18, but I don't believe the specs, as it seems to run just as well is the old Mag, so I think this pump is under-rated.
Both are very quiet, basically silent, and I cannot hear them.
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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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