So I recently installed my first water cooling system over the weekend and bought an MCP35X pump since, from the specs I could find, it was one of the most powerful, and I didn't want to have to worry about whether my pump was powerful enough or not. Anyways, I have the tubing routed as follows: pump -> radiator -> CPU block -> GPU Block 1 -> GPU Block 2 -> Reservoir -> Pump. Problem is, the water doesn't seem to be circulating. When I power on the water cooling system I can feel the pump humming along and I can see water being intermittently pulled from the reservoir, but I see these big bubbles in the tubes that don't move unless I lay the case down and back up, and there doesn't seem to be any water reaching the GPU block...not sure what could be causing this...