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Probably because you haven't added a nitrogen source.
Feed the tank with fish food, or even pure ammonia. The goal is to have an initial ammonia spike of 1-2ppm.
If you are using cured, always wet, live rock, you may not get much of a cycle though.
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Pat
Current Tank Info: 125 in-wall , 40b sump. 6 bulb T5. ASM G2 skimmer. LPS and leathers
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