Ditch the sand it will cause you trouble that you dong need, I recommend new sand , you won't barely any of a cycle just from what's under your rock from your sand stuff that got stirred up. Use all the water you can and be fast about it. 100g is a great holding tank and you can hold the fish there for quite a while if need be. I would suggest housing them for a few days if you can it will give you time to aquascape and get everything set up without stress to them .heaters,cludyness, plumbing tuned, water oxygenated etc.
I moved a 180 across the city using same sand I gad Jo losses but I wiuld use new if I had the chance again.
I moved into a new 110 from my old 110 did it all in the same day using new sand and housed fish in a holding tank and I had all the comfort in the world setting it up, had no cycle and added all my fish a few days later
