nitrate help old live rock

[Chris82]

Bought a used tank about three years ago and as a newbie used the four year old sand bed and live rock.
Tank was a cyano disaster and very neglected.
I got cyano prob fixed and started with some lps .
I have always had an issue with high nitrates but had not been to adverse on the LPs.
I have now decided to give sps a try and have been trying to get nitrates down and for a year been an impossible feet.
I belive my lr and sand bed are saturated.
I am at the point if just taking all live rock out and Sand and turfing it and starting from scratch.
I have bought a new tank that is is the works that I will be transferring all the corals and fish to when it's ready.
In the interm would it be okay to just pull the lr and sand out of my tank that running and leaving it more or less empty or will this shock my system and kill the corals or fish?
Please chim in with opinions and facts on doing this.