Hi
I don’t know what depth your send is/was but if it is over couple of inches I would handle it very carefully and wash it for sure. Don’t touch the send before you get all the livestock and rocks out. In some cases a toxic sulfide compounds can get into the water body and kill everything.
If you are planning to add rocks to the new tank and there are dry rocks you should cycle them in a separate tank/canister before introducing into the main tank.
One should keep in mind that the aquarium is a dynamic living system, cycling is an important part of it….your system always unnoticeably mini cycling and any major change will result in some more substantial cycle.
Good luck
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