Had to google rubbermaid - thought it was a paddling pool!
I guess if the tupperware box is large enough, and covered to keep fish in/cats out (assuming you have cats) then it will work as a tempory solution. Keep an eye on the temp as these setups aren't as well insulated as tanks and hold a small volume of water, so are liable to fluctuations, especially if the ambient (room) temperature fluctuates that much - we're expecting 4" snow in London tomorrow, no doubt bringing the transport network to a halt! Hope it's not as cold wherever you are.
I guess if the tupperware box is large enough, and covered to keep fish in/cats out (assuming you have cats) then it will work as a tempory solution. Keep an eye on the temp as these setups aren't as well insulated as tanks and hold a small volume of water, so are liable to fluctuations, especially if the ambient (room) temperature fluctuates that much - we're expecting 4" snow in London tomorrow, no doubt bringing the transport network to a halt! Hope it's not as cold wherever you are.