Another sand removal question

[Coralgurl]

When we started our 55 gl sw tank, we left the gravel from the fw tank in the bottom and piled the sand on top. I want to restart this tank so the sand gravel mix has to go. So, if I remove this mix, add new dry sand am I going to recycle the tank? Bit of a debate going on here in my house. My plan is to remove the rock to a bucket with tank water, remove sand/gravel, put rock back. Minimal time for rock to be out of the tank-basically tank to tub/tub to tank.

I don't have a deep sandbed, will put this mix in water as well to try to get some of the sand back in tank to seed, lots of good stuff in it.

Anyone see any problems have suggestions?