That Via 1300 is a POS. I bought one and the pressure was terrible on a test loop with less than half the complexity of yours. If you use them both, put that first, because you might lose as much pressure to pump resistance as you gain in circulation force. I ended up scrapping that Via without putting it in my machine at all. I feel that putting them in series (I can't explain how I came to this decision ... I can picture it, though) with the Via feeding the Eheim might (I dare to say WILL) give you the best results. Putting them in parallel might cause minor backfeeding from the Eheim loop to the Via lowering your net system flow and your Via, besides lower flow rate through the entire system will serve as nothing but a heat battery.
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