The one big thing is to ues all old water.......
get a big tub pull 1/2 of the water out put lr in it all must be under the water with 1 ph in it.. and if you have qa tank put live stock in it with the small size lr with them if not get one will need later, 10-20gal will work with 1 ph in it if you have a hob filter ues it aswell . let water clear up and pull out all but about 1/2in.pull 1/2 of sand/cc/or what you use out put in buket or what will hold it.the outher 1/2 of it pull it out and clean with clean water.(find all live stock first).
now to go back in.....
1st dran all water from sand you did not clean put it in 1st from side to side.
then the clean sand on top.now try to get sw from lfs (used from tenks)
if you can not get new sw(about 10gal or so).put a big glass in tank trying not to messup sand intell your lr will go in under water.add all lr then add old sw to top off but for the water in qa tank.run ph/filter/sump/skimmer after water is clear test i bet all will be ok and put in all live stock.....
all has worked well 4 me from 10gal to 26gal to 48gal to 55gal to 75 gal to 125gal .......lol i got it bad.......