One of my tanks is 2.5 gallons, the other is 1.5. Can I switch my fish every week or would that be too stressful? The smaller one gets the heater since the air is just a bit too cold (lower 70s) And the large one gets the space/ bubbles. If I do this I'm planning on doing it every week. Right now the fish in the small tank is just filled with energy and the larger tank fish is more mellow and slow. Is this a good idea?