With all that you have in the tank let it fall naturally over a few weeks. Or keep it where it is. Either should be fine. I used to use reef crystals. I changed because the parameters varied a lot bucket to bucket, and alk was too high for my liking. For awhile I'd dose a few ml of hydrochloric acid to my new salt mix, and bubble it with an airstone over night before my water changes. This drops alkalinity but you don't want to add it to the tank, as it also kills ph temporarily. Eventually I changed salts.If it's high like that how do you bring the number down?