help with my remora pro skimmer

[Finaddict]

So after hours of draining water, moving the tank out from wall, we put the skimmer on back of the tank & it did not fit so hubby cut the plastic.

ok in place I adjusted the knob in box and plugged in,

well the skimmer filled and did not stop filling up.
please help, I have adjusted the rubber ring on box and it still fills.

any suggestions or help

now i have this great skimmer that is off atm , so I put my old remora back on but hanging off the front!

tia
Connie