It's just syphoning from the display tank right now. It's hear the top, so in the event that i lose power, this intake will be slightly higher than my anti-syphon hole in the return line.
I havent had any issues with losing the syphon so far, afterall the effulent output controls how fast it syphons as well. All I have to do is open up the up effluent output.
BTW, I took off the screw that chokes the intake, and I put a 1/4" John Guest ball valve on the output. This is a big tip that I got from another forum. You get more control by choking the output, than choking the intake.