Hey Doug,
It was asked earlier in this thread where I run my water height. I said I run it at the bottom of the lower riser and I think that's incorrect.
When I feed my tank it shuts the foam production down in the skimmer. When this happens the water height in the skimmer is just above my inner pvc pipe. So I guess this would be my correct water height.
I don't have an elbow on the pipe. I find that there is alot of swirling motion inside the 6" acrylic tube. I don't think an elbow would help anything. When the skimmer shut's down after feeding the motion in the 6" riser tube is extremely violent and swirly

. The water doesn't come out of the tube evenly.
Let me know how the Modification works!

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No matter what the morrow brings, inventors keep inventing things.
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Jonathan
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www.cakerybakery.ca