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It is likely with the smaller quantity of live rock and sand that you’ll not have enough area for the anaerobic bacteria needed for nitrate reduction to live. Wouldn’t hurt to add some ammonia to confirm the cycle is completed, but yes if it was actual live rock then the cycle is probably done. Macro algae and water changes will get that nitrate number down.
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My build thread:
http://reefcentral.com/forums/showthread.php?t=2548422
Current Tank Info: 65 gallon mixed reef, Eshopps sump and HOB overflow, RO-110int skimmer, Reefbreeder 32" photons V1.
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