Larger tank

I have a 65 gallon tank with crushed coral, 75lbs or so of live rock, corals, and 4 fish. I just bought a 90gallon and I want to transfer everything to the new tank. Is it possible? Do I use the old substrate as is? Wash the old substrate? Or do i add all new substrate? Is it possible to do this without killing everything?

 

Toss old crushed coral and start new tank with dry sand with a cup of old crushed coral (or live sand from an established tank).

 

I would add a cup or two of the live sand in order to seed the new stuff. That is assuming the old tank was a reef tank.

 

not sure if you have to discard any of your sand. That would depned on how old the sand is.

 

How do you think the tank and inhabitants would fair with this transition.