How much suspended sand is in the water? If you can still see pretty well through the tank, I'd say it would be okay, but not optimal, to put the fish back in their home.
In the meantime, put an airstone in the rubbermaid to keep the water moving and provide oxygen to the fish. That should help tide them over until their newly redecorated home is ready... If you can, put your filter in the bin, too (if you've got a canister, this should be easy enough... not so for a hob)....