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…
 

WHAT’S USUALLY THE FIRST CLUE THAT SOMETHING IS OFF IN YOUR REEF?

  • A fish’s behavior or appetite changes

    Votes: 12 16.0%
  • A coral looks different or stops opening normally

    Votes: 45 60.0%
  • Water clarity or surface appearance changes

    Votes: 10 13.3%
  • Equipment sounds or flow seem different

    Votes: 8 10.7%
  • A test result catches my attention

    Votes: 15 20.0%
  • Algae or other growth starts changing

    Votes: 15 20.0%
  • I usually notice when the problem is already obvious

    Votes: 4 5.3%
  • It depends on what’s going on

    Votes: 15 20.0%
  • Other (Post in the comments)

    Votes: 1 1.3%
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