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I second the Maxijet. I have used them for over 10 years with minimal failures. If you are buying new, get Maxijet. If you already have the Hagen, I'm sure they will be fine.
I use a single 1200 in my 55. It provides a very gentle flow throughout the tank. I would think a single 900 would do the same in your 38. I would double them if you are looking for medium - high flow...
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210 Gal Reef 3X250 HQI, 156W T5 Actinic
90 Gal Now the refugium for the 210
55 Gal Reef 80W NO
12 Gal Cube 64W PC
10 Gal Hex 18W PC
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