If the purpose of this question is to either QT the fish or house them until another tank is ready, then I wouldn't recommend it at all. If that is what you are wanting to do, I would A: get a larger QT tank and only QT one every 2 weeks. If you are waiting for a larger tank to become readily available and healthy to the fish, I would just have your LFS hold the fish until that time.
Ask yourself this question...."If I were a fish, how would I feel in this situation and environment?" This doesn't just go for this situation but in every situation involving a living thing and the environment you place that creature in. Best of luck, and I hope you find your answer.
Clint