Your tank is still young give it time. Are there any critters in it yet? Sand? Are you doing any water changes? Do an ammonia and nitrite test on new salt water to see if it is your kits. Do NOT use buffer to try and correct pH issues, only add buffer when your tests indicate that hardness is low. Again, your tank is still young so it is not unreasonable to expect that some of your numbers may be out of wack a little.
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