Hey there,
I too have the Nexxxos XP block and AQX 50Z (MCP 600), although I'm running two of them in series.
The impression I get from Cathar is 13.5v is ideal for these pumps, and 14v is OK.
I WAS under the impression running the pumps with more than 12v wouldn't be worth it for the cost, BUT I've just found a 13.8v 3A DC power supply for £15 (I'm in the UK), so that is a very tempting option.
In fact, I'm sold.
I'll do some flow tests at 13.8v soon and let you know.
I got exactly 6 lpm through the Nexxxos with the two AQX @ 12v. That was with the nexxxos only.
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