Well, not really exile, more of a temporary home while their main home is rebuilt.
Due to a couple of reasons, we relocated the inhabitants of our 38 gallon tank to a new home, a 20 gallon long aquarium. The puffers in question are small, less than one inch, fresh water fish that originally come from rivers in India.
The main reason was that their old home was showing the beginning of a structural breakdown in the foam foundation underneath the tank, which would have stressed the tank to point of (eventual) failure.
In addition, while the current stand is strong enough, it was never intended for aquatic use and so we want to move the tank before any harm is done due to the inevitable water splashes that accompany aquariums.