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  1. General Reef Discussion
    I was wondering how big of a return I should get for my 50 gal and how many GPH my overflow does. My overflow box looks like it has a 1 inch u tube and a 1.5 inch drain. Also 2 powerheads came with my tank. The kind for a under gravel filter. I have a 402 and a 802. Can I use them for anything...
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