Bought new? Or used?
I assume live rock and bagged live sand? You should really rinse any sand before it goes into your tank.
If the sand bed and rocks are harboring nitrates that could be the issue.
...did you ever share the gallon size of the tank? And a complete stock list?
If you pick up a handful of sand off the bottom of the tank and let it fall thru your fingers back to the sandbed, does it cloud up? Or is the water still clear?
I assume live rock and bagged live sand? You should really rinse any sand before it goes into your tank.
If the sand bed and rocks are harboring nitrates that could be the issue.
...did you ever share the gallon size of the tank? And a complete stock list?
If you pick up a handful of sand off the bottom of the tank and let it fall thru your fingers back to the sandbed, does it cloud up? Or is the water still clear?