Chiming in to see if OP ended up buying the eflux and is happy with it.
I just purchased the 1050gph model of the eflux and without the feed mode option, when turning my pump off and on it goes full blast and not at the setting I had the dial set on. I have to turn the dial all the way down, and after the pump calms down, set it back to the setting I want. Frustrating.
Waiting to hear back from Current support but I wanted to give my input.
Good quality and super silent tho. Cannot hear it at all.