Newbie question but I’m not a newbie

[JurisHP]

I am replacing my sump with a Bashsea SS-36. I’m worried about the 2 hoses that plumb into the 2 holes in the sump. Once I remove them from the old sump, how do I prevent the tank water from flying out of those 2 hoses? Should I turn the valves off and shut down the return pump?

 

[T_BONE]

Those look to be drain hoses. Once you shut off the return and let it drain completely there should be no flow from either of those hoses.