Who knows alot about orp??

So I've never really paid attention to my orp but I saensumehere where it said its supposed to be between 250-350 so I was wondering g how I'm supposed to lower it

 

Yes I do have the probe for the apex and its been basically a constant 920ish an I just never paid attention to it because everyone I've asked always said its nothing to worry about.

 

Funny you say that, my tank did die off.. I wasn't able to keep any type of coral alive then right before my tank crashed I bought a apex controller then shortly after ingot that is when I started having major problems with my tank and a couple days later everything fish and all were dead I tore the tank apart bleached everything and set it back up let it cycle for 4 months and its still 921 if I add vinegar it'll drop clear down to 600 ish but go right back up along with the ph to 8.3