Flow through Sump?

[tomreefer]

I have a Red Sea Max E 170 and Jebao DCP-6500 pump.

Red Sea recommends 2700 lph or 713 gallons per hour to go through sump.

The 6500 I am guessing 2ft head loss.

The 6500 uses 55w and max 6500lph

I am guessing I should be using about 42% of the 6500 guessing 23w; As of now I have it at 15W.

 

[mcgyvr]

2ft of head is unlikely..
Measure it if you want...
and then remember that flow rate recommendations are largely seat of the pants stuff and highly generalized.

 

[Sk8r]

In general, it depends on how fast your gravity-flow from the main tank can drain down TO the sump. Having a valve on your 'up' line to provide artificial 'head' (ie, slow down) the flow of a potent pump is a good idea, to prevent overflow in the display tank. When I was running a 55 display with a big pump, definitely I had it valved down; but when I traded to a 102 with a rapid drain-down, I just opened the valve all the way, because it could handle it.