Thanks BillA !
If I can get the math for more of this figured I'll be able to keep my learning curve going.
BTW, when I first found this site my idea then of a high performing system was: Eheim 1060 pump with a BIE rad & maze 3 block with 1/2" lines and standard nylon fittings of all types.
Now I know I still need more work on the "best cooling system" for what I'd like to set up as a system, but none of the above will be in it except some 1/2" line.