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 PART OF YOUR SETUP IS HARDEST TO REACH OR REMOVE FOR ROUTINE MAINTENANCE?

  • Glass behind or beside the tank

    Votes: 10 23.8%
  • Powerheads or wavemakers

    Votes: 3 7.1%
  • Sump or rear filtration chambers

    Votes: 5 11.9%
  • Skimmer or other filtration equipment

    Votes: 4 9.5%
  • Overflow or plumbing

    Votes: 8 19.0%
  • Lights or lids

    Votes: 0 0.0%
  • Mine is pretty easy to access!

    Votes: 11 26.2%
  • Other—tell us what I missed

    Votes: 1 2.4%
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