It will settle down within days. Actually, to me a better way is to place the LR
first, cycle the LR
and siphon out the die off for a few weeks. A bare bottom is much easier to deal with for cleaning than with sand. Also the LR
have better support on the tank glass than on the sand.
Then when the die off has subsided, put in the sand around it. Don't worry that you can't get the sand into the hard to reach area. Try the best you can and as time pass, the critters will do the job for you. After the sand storm has subsided, use your hands to wave off the sand on the LR
. This is how I does mine. Patience is the key.