need advice about replacing new tank.

[NVTE]

I am going to check my tank soon, but I don't know how to do it without killing my livestock. here the the plan.
I am going to drain my old 60gal water into the big trash can and put the rock & attached livestock into that trash can. Move the old tank out and put the new tank in same place. Add the sand from old tank to new tank. Put the live rock with livestock in and pump the water from trash can to new tank. I try to do it within 40 min interval. can softies survived without water for 15 min or so ? if not, I have to take all the attached livestock out and epoxy them later.