As mentioned earlier, 5 gallon buckets for critters work well.
- Put the fish and corals in 5 gallon buckets, lightly loaded. If possible, place a small piece of rock in the bucket.
- Place the buckets in some rubbermaid containers or a bathtub filled with tap water.
- Place a heater in the tub or the rubbermaid to keep the bucket water warm.
- Place an airstone in each of your buckets, running from a common air pump.
- Fish should be good for a day or two while you setup the new tank.
If you need longer than two days to get the tank back up, keep some extra saltwater around (you can premix this at your new home in 30 gallon plastic trashcans) and perform 25% water changes on the buckets every day or two.
- Keep the sand/gravel damp till you place the tank
- If you have media in your filter, use a powerhead to pump water back through the filter, like a mini-closed loop. This keeps the bacteria alive.
Once the new tank is up and aquascaped, acclimate your fish and corals back to the new water by dripping them with an airline. You should have enough extra saltwater on-hand to top off the tank as you acclimate.
Take this opportunity to rearrange the tank and fix those items that you need to change or update.
You can always place your lights over the corals in the buckets, but a few days of no light will not hurt them.
You can also use products like AmQuel to help keep the ammonia levels low while the fish are waiting for their new home. When the fish and critters are introduced back into the tank, use something like Stability or other live bacteria supplements.
Rushing things breaks equipment, kills animals and can damage persons. Take your time and make sure the tank is setup correctly and ready for the addition of the critters. Remember to introduce the bullies last.
-Rob