There are power supplies that have a slow 120mm fan. Probably the quietest possible.
Meethoss,
What are those two 120's on the side for? This is an external case to house the cooling stuff only, right? If the case is going to be air tight, or at least the area with the fans and shroud, you should be able to get away with only one 120mm fan.
As for quick disconnects, Marineland makes 5/8 inch quick disconnects for their magnum filters. 1/2 inch tygon will fit. I got a piece of 1/2 inch tygon to fit on a 3/4 inch pump inlet by soaking the tubing in hot water and stretching it.
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