no.
you can keep your tank 'running' till tomorrow as long as the water is circulating.
Do you have a air pump with an airstone? Drop that bad boy in there, or if you have a spare powerhead you can run to keep water moving and oxygen exchange happening. Stagnant/stale water is bad.
This is what we do in Florida when the hurricanes come.
They should be fine until tomorrow, worst case scenario if you are really worried, hit up a 24hour walmart and grab a little filter to hold you over.
They should be fine. Dont feed either, they can wait till tomorrow.
Thats what I would do anyway.
Good Luck!
Jessica/Shrimpi