Hi, recently I have encountered similar problems to the thread starter.

I am running the following items in my loop:

Swiftech Apogee GTZ
DangerDen 4870x2 waterblock
Laing D5
Swiftech MCR320
Feser One Coolant - UV RED

Over a time span of running this setup for 3 mths, I noticed that my cpu temps are getting worse and worse. But gpu temps still remains the same.

I am looking at 5 deg increase for idle temps and over 10 deg increase for load temps. The GTZ is definitely trapping some gunk from the coolant.