Thanks for all the info you’ve been mad helpful , I appreciate it and ye the Aqua will be on top of the overflow and I plan to cut the return tube just above the water line so the syphon will stop if power ever goes out (a lot of extra room in sump for water but better safe)Well wadaya know. Since you have two drains in your overflow you can do a herbie style plumbing for pretty much silent operation.
Stockman standpipe is for single drain tanks.
Google herbie, a valve and a couple of elbows gets you going silent
When you get your aqualifter place it on top of overflow box or higher but definitely not lower than the top of the overflow box. Incase pump fails or hose pops off it could get messy/siphon