Switching tanks: Sandbed moving ?'s

[ScooterGuitar]

I am possibly going to swap out a 75 for a 90, maybe even go lots bigger.
My concern is if I do, what about my sandbed? It is 3" in a few places, but I would guestimate it to be about 1" if it were still level/flat. The sand is for appearance, but I imagine this has good stuff too since it has been running for close to 5 years now.
The new tank will go in the exact spot the existing one is, so it will be a long day when/if it happens.

Do I get rid of the sand (fine), reuse it, or? Since I'd be switching all livestock over, I need it to be as safe as it can be. Do I rinse the sand or just scoop it and hope for no gas/nitrates, or just go with all new sand?

Thanks!

[Ritten]

I've always kept a shallow sand bed. The two times I have upgraded my tank, I have used two or three cups of the old sand (taken from the front where it has been siphoned clean during water changes) and added new sand for the remainder.

[arredondojason]

you can rinse your sand till you dont have cloudy water coming out anymore and then move it over this is what i did when i moved my 135 gal to my new 240 gal.

[ScooterGuitar]

Thanks for the replies.
You rinsed it and changed over all in the same day?

[BigRedSpecial]

That's what I did, rinsed it in old tankwater, put fresh new sand in the new tank, then transfered the old sand over on top of it.

[ScooterGuitar]

So it would obviously be losing any of the good bacteria. Should I try to save any of the good sand? Maybe several cups full and add it or simply not worth the effort or danger?