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>I've been "lurking/observing" this list for some time now trying to get up
>to speed on the latest to do a planted tank.  I am returning to this hobby
>after some 20 years and a great deal has changed in that time.  Perhaps this
>is a question for Tom Barr specifically, but I thought I might as well throw
>it out to all.  I am setting up a planted 55g tank with a Flourite/Sand
>substrate.  Tom's approach of providing flow to the substrate via a CPVC UGF
>is one I am going to incorporate since I am starting from scratch.  Even if
>I find I don't need it - it will be in place if I do.  There is also
>considerable talk (on other boards as well) about limiting the amount of
>water current in planted tanks by using a spray bar.  While I was
>constructing the CPVC UGF, and in particular the riser tube, I thought, why
>not integrate the spray bar with the UGF?  That is, use two risers (at each
>end of the tank) and connect them with a horizontal bar just below the water
>line to act as the spray bar.  The entire apparatus would be subject to
>pressure/flow from the filter discharge.  It will take some experimenting to
>determine the number and size of holes to place in the horizontal bar versus
>the UGF but it should work.  Just guessing I would say I want about 80% of
>the flow coming out of the spray bar and the balance going to the UGF.  Has
>anyone tried this variation or have any comments?
>Bob Welch

Yes, this is what I do on all the RFUG's. My flow split is about 50/50 or
30/70 with the first going to the spray bar. Plants don't seem to mind
slower or higher flows. 
Tom Barr