How did you do it with fish in ?
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I pulled out all of the driftwood and used a coarse-mesh net to pull gravel out of the tank.
I might've taken some of the fish out, but we didn't take all of the water out and I think we left at least the big guys in.
I did a really good gravel vac before I started.
After enough gravel was out, I poured the sand in at the corners and middle and smoothed it over with my hands.
You could put the fish in a rubbermaid tub - sometimes we do this when we're rearranging the tank because it gives us a chance to "take inventory." In a tank that large, with so much wood and plants, it's easy to lose track of what you've got.