Why don't you just use SLI connectors/D-Plugs to bridge the two cards? It would look much cleaner than the tubing you have routed around them now.
I actually tried using the Bitspower SLI connectors, and strangely it caused restriction in the flow (I didnt expect to see that from such a short path). I'll use an SLI connector when it has a larger inner diameter. Thats why I have them on tubing, but I agree it does look sloppy. I have found an EK FC link/connector, so next month I'll switch them over (parallel flow).