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…
 

WHICH SUPPOSEDLY EASY CORAL HAS GIVEN YOU THE MOST TROUBLE?

  • Zoanthids or palythoas

    Votes: 20 20.0%
  • Mushrooms or Ricordea

    Votes: 20 20.0%
  • Green star polyps

    Votes: 13 13.0%
  • Xenia

    Votes: 10 10.0%
  • Leather corals

    Votes: 10 10.0%
  • Duncan or candy cane corals

    Votes: 22 22.0%
  • Birdsnest or Montipora digitata

    Votes: 26 26.0%
  • None—mine have lived up to the reputation

    Votes: 5 5.0%
  • Other (tell us which one)

    Votes: 3 3.0%
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