I think it depends on what you mean by live rock. Once you have the beneficial bacteria on the rock that is processing your cycle then technically it is "live" rock and is performing a service to you. If you're asking when you're going to get coraline growth on it and have it blend into your tank YMMV
depending on your lighting, Ca
, etc. I put 100# of base and added 60# of keys/gulf mix from LR
.com and right now there are some pieces of my base that you can't distinguish from my LR
and it has only been in there since Mid-November.
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