Back drilled tanks

[DiverDude]

You could do a coast-to-coast overflow, like this:

http://www.beananimal.com/media/4054...de_500x375.jpg

[ScubaSteve]

Ditto on the above. I assume you're using a sump, so I highly recommend and overflow of any sort. I recommend the beananimal overflow set up. YouTube it and you'll be sold.

[blacknife]

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