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danmhippo

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How much head from the sump to the main tank? What's vinyl hose are you using? How much turns there are on the way?

The pump to be used depends more on the path to the main tank.
 

jhaag

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I'm running a Mag9.5 on my DIY 3612 and I have a little microjet in there to help keep good current. If I try and move too much more current I run into problems with bubbles making back through the tank and my overflow makes me a little nervous. This is on a 90gal tank. I would probably recommend maybe a Mag7. If you go to ecosystems web site, I believe they list flow rates for each of the models.
 

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