Planted Tank Guru
Join Date: Jan 2010
Location: Contra Costa CA
1) Get a plastic storage bin to temporarily hold the fish (about a month) and everything else until the aquasoil has matured.
2) Set up the new tank, aquasoil, driftwood, rocks, plants... add water.
Monitor the ammonia, and do lots of water changes. When the ammonia is gone (it really isn't gone, just the production is a lot lower and the nitrifying bacteria have caught up) you can move the fish back.
3) Optional: Once you get the new set up going you can try repairing the old tank, or return it if there is any warranty. If you can repair it you could probably get the fish out of their temporary plastic home a bit sooner. (Then you have another tank!)
I have no idea what you might use to watch that the tank is not leaking. If it is not a display tank then a large, shallow storage container might work. Be sure it has good support right where the tank needs it, at the rims (glass tank) or all over (Acrylic). Don't use a ribbed storage container, it will partially crush under the weight of the tank and water, making the support uneven.