it will depend on what you would like.
I would go with 1 in and 2 out .what are you running for a return pipe?
are you running 1 pipe of is it 2 return pipes
HOw many holes do you want in your tank or you can do the cheap way and have it piped out with PVC and piped back in with PVC. Its all up to your self
Mike
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180 starfire front, LPS, millipora
Doesn't matter how much you have been reading until you take the plunge.
You don't know as much as you think.
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