Pumping Oxygen into Tubs

I have put a water pump in the last tub that i have with a hose leading to the resivoir. This is pumping the nutrient into the resevoir.......

I have also put in an Air Stone into one of the tubs in the middle and also into the Resevoir for oxygenating.

Will this take care of my oxygen and recirculating needs. Will it harm the Roots in that particular tub where the Air Stone is.

Appreciate any comments

nope, what you are doing is great. how big is the REZ? you may want more bubble bars/stones if you have a large REZ.

the rez is 70 litres....

exatly correct keep going.