Time then. That isn't a lot of media for bacteria to live on. Will take time for them to colonize it. I know it's frustrating but slow and steady is ok.
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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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