Yes I used LSM . I have a dual chamber calcium reactor put LSM in first chamber
And aragonite in second chamber had it running for 2 yrs . It will bring your nitrates down to 0 but it eats up alkalinity / ph always adding alk I just recently
Changed to brightwell x port no3 and x port po4 media. I have 90 gal tank with 14 fish phos measure 0.08 and nitrates between 5-10 with salfeirt test kit.