if it is side drilled high you could just put an elbow on it and go from there.
if it is low i would go with an overflow.
I would also go with doing something <herbie, bean> to reduce the noise i have a side drilled tank with overflow but there is not enough room in there to build any noise reducing contraption and it is VERY loud and gurgley.
drove me so nuts i took it down a week ago. heh
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