Wait, 700 bucks for a Red Dragon 80W pump? And another large chunk of money for a controller? Does that seem a bit much? How does this stack up against the COR? For a pump to just plug in and never touch, DC seems like a waste. I would just get a large AC pump and let it go. If you're looking at failure points, AC should have less all of the time.
I've used two pumps now, a Sicce 5.0 Silent was my original return pump on my 120g tank. I got just about 400 gph through my rigid plumbing setup, which is not ideal, I agree. But, I have a Deep Blue 120, so the vertical returns are 0.75" anyway, and I don't have the energy to replumb the tank to a more reasonable 1.5" or so.
Now, I have a COR20 as part of the NSI program before it officially launches. Terrence can correct me, but I think based on some of the communications, it shouldn't be much longer.
The COR-20 I have running at 58% to 440 gph, which my Apex reports back as 57W, and 60% of temperature. I believe these numbers, my plumbing is way to small and I have an FMM on my system, I've seen videos of FMM bucket tests etc. Now granted, Fusion is measuring at the pump, so it does not take into account the losses at the power brick. But, the brick runs fairly cool, maybe 10W or so if that much? Seems reasonable.
But the point is, if you're going to get a DC pump, why not get one that is cheaper, seamlessly integrates into Fusion, but has a backup system in case of failures? I don't want to sound like an Neptune salesman, but really, I stand behind their products 100%. I can't imagine running a reef tank without an Apex controller attached.
The IQ-Level feature of the COR sets the max and min flow rates of the pump, and stores them on the COR controller. If the Apex head unit fails, and I've tested this, the COR just keeps doing its thing in standalone mode. That's it. So really, you've eliminated the extra failure modes that were described earlier in this thread, somewhere around page 5. The standalone interface is super easy to use, fully functional, provides comprehensive feedback, etc.
One of my favorite things, and I never thought it would be as cool as it is, is that by setting the IQ-Level minimum speed, when you go into a feed mode, you can use the pump to keep just a trickle of water flowing through the returns. This way, when you come out of the feed mode, you don't get the air/water slurry filling the tank, and the associated microbubbles. I HATED that about turning the Sicce on and off, microbubbles for hours after a feed mode. Here, it just comes on a does its thing. If not for the increase in surface ripple, I might not even know what was going on. It really, really is good stuff.