I had to keep my fish in a big rubbermaid garbage can for 3 weeks and it was fine, Just make sure the can is well prepped to temp and water tested before everyone goes in.. I used vinigar and scrubbed the can and rinsed thoroughly to ensure I wasnt leaving a crapload of dust and whatever other particles might have landed in the garbage can during the many arts and crafts going around my house. I had my corals in there aswell, I had a light over a garbage can... The 15 everything was in started leaking when I was cycling their new tank and had to make due. Funny thing is in that three weeks the garbage can looked like it was doing better than my 15, hahaha!