So since my last post I went ahead and rebuilt everything with a new EK Nickel block as I had rma'd it, and switched over to using Mayhem's X1 clear/uv blue. Everything has been running well for approximately 4 months. The one thing that I just noticed that concerns me, is that the primochill uv blue tubing that runs from my pump to my reservoir appears to be cracking internally, at least it appears that way. Looks kinda like a spider web. The tubing isnt brittle or hard and it's the only tube in my system that exhibits this visual oddity. I'm thinking it may be plasticizers but I cannot say for certain so I was wondering if anyone had any idea what this may be and additional if it something I should be concerned about? Temps have been right around where they should be, water is crystal clear and all the rest of the tubing appears normal. Please feel free to bounce some ideas off of me if you have any.