IMHO a "upflow" is not a good idea.. there have been several threads about people who have tried that and they ends up with a tank that always has a slight haze in the water. then benifit of a down flow is the bed remains tight and acts as a particulat filter whare as a in a upflow it woulden't.
I have seen Darrens running and I have also seen Bruce's (which is a copy of Darrens) and niether had any bubbles..
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*
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