want to buy overflow need help

Eshopps and lifereef make decent overflows and are probably the most popular, (I hear CPR's are easier to clog, and that's NOT a good thing), or, if you're a DIY'er and not afraid to drill your tank, Glass-Holes.com dope aquarium stuff makes excellent overflows as well. Even better but more DIY, is the bean animal overflow.

A standard eshopps pf300 would do fine for your tank, but I'd be inclined to pay extra and get the pf800, (the wider the overflow, the faster it can 'skim' the surface). Reef Aquarium Filtration: Eshopps Overflow Boxes
 
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