as big as you can afford.. IU have two 1.5" overflows on my 94 gal but basicly you want to figure out how much flow you are going to put through it and decide from there.
Steve
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 *everything said above is just my opinion, and may or may not reflect the views of this BBS, its Operators, and its Members. If cornered on any “opinion” I post I will totally deny having ever said this in a Court of Law…Unless I am the right one*
Some strive to be perfect.... I just strive.
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