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Pipe diameter with DangerDen block (3/8") and cooling cube.

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Also its tubing from a aquatics store, nowt flash....ive seen people talk about surgical silicone tubing?? but do i need that?

ooooooh the confusion :)
9mm is a bit smaller then 3/8" (9mm = .354in, 3/8in = .375) it will slow down the flow rate some and put a bit more strain on the pump, but i think that you'll be alright

The only reason that I can think of that you want to use surgical tubing is if you have to have some pretty tight bends in the tube, but small radius bends also put more strain on the pump and reduce flow.