What happened was I topped up my tank from evaporation and I added salt water instead of plain water therefore the salinity spiked (I know my mistake). My tank is 40gallons and has been running for atleast 6 months now. Everything was doing awesome til now. I probably should have reduced the salinity gradually rather then all at once. Is the sand turning red/brown due to the algae spike??? Do you think it is just going to take some time for everything to adjust? My tank has a skimmer and filtration in the pump.
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