What are your nitrates? How old is the tank? Did you start with live or dry rock? If dry, how long was it cured and did you add any live rock to help cure it?
0 phosphate is a bad place to be in a newer tank as well.
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Ryan
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Current Tank Info: 50g Cadlights/Giesemann Spectra (250w Radium, 2 ATI Blue Plus, 2 ATI Actinic)/2 x Vortech MP10wQD/Skimz SN123/Eheim Compact 3000+
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