I have a 180DT with a 105 Refuge and use the following:
- EuroReef RS180
- Hydor 1000
The Hydor is about 1.5 months old, and I can say it is my favourite... It is rated at 265 gallons with heavy bioload. With it running with my EuroReef, I can see changes happening, things I didn't see before. You may want to look into this one as well.
Kevin @ Red Coral carries them and has one running in the store. This is where I saw it go and then decided to try.
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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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