Fluval Evo, First Saltwater Tank

Parameters today are reading at:
PH: 8.2
Alkalinity: 7.5 dKH/2.68 Mep/L
Ammonia: 0.03
Nitrite: >1 (>5 API test since higher range than Red Sea)
Nitrate: 15
PO4: 0.01

still no clue why nitrites are so high even after a 60% water change yesterday…. Any way to get them down other than large water changes as they seem to be doing nothing for the nitrites. I know they are not harmful to marine critters, but the high number still freaks me out + my corals have been seeming unhappy lately and that is all that seems out of order…
 

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WHICH SUPPOSEDLY EASY CORAL HAS GIVEN YOU THE MOST TROUBLE?

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