Thanks for the inputs. Leaning toward the Kamoer X2S. On top of the 2 dosing pumps, it has an ATO, similiar to the AutoAqua.
The downside of AutoAqua is that it depends on the set distance between the 2 optical sensors. Having that in sump, if I do say a 15% water change, the water level in sump drops, whilst the pumps continue operation. Eventually that water volume drops to a point where there is no return flow to tank and no overflow back to sump? A little unsure on how that works out.
Just placed an order for the Kamoer. Hope that works out! Else you will see me posting on marketplace soon.
https://www.theaquariumsolution.com/product/8258/371