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Old 12-07-2004, 10:29 AM   #1
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Adding additional Live Rock to a cycled tank?

I currently have a 75 gallon tank with a few fish (damsels), a cleaner crew(snails/crabs) and about 50 lbs of LR. I was thinking of adding about 30 more lbs of LR from LR.com. Will that cause the tank to recycle? Will it kill of my invertebrates?

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Old 12-07-2004, 10:37 AM   #2
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If your tank is already cycled, you should be ok. You might have a small cycle, just make sure you have some aged SW ready in case you need to do a water change to bring down any ammonia spike. Some will say that you should cure it in a secondary container, but from what I have heard about liverocks.com, you should not see much die off from their rock.


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Old 12-07-2004, 11:14 AM   #3
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When you get the rock from LR.com, they say specifically not to cure it. It comes straight out of the ocean and doesn't have much dieoff, if any. If I had a spike, it came and went without me noticing, and I checked every other day for a week I think (now it's at least once a week).

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Old 12-07-2004, 11:28 AM   #4
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What about the die off during shipping? It is getting colder out.
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Old 12-07-2004, 11:50 AM   #5
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I did the same thing in my fifty five tank. Originally I had about 25lbs of LR and I bought an additional 30lbs of live rock for my tank from the LFS after it had already been established for a year. I saw a small spike in my ammonia levels so I did 10% water change every week for four weeks and that kept everything under control.
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