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Old 03-05-2007, 02:02 PM   #1
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Curing LR in New Tank

Hi, I'm new to this site and it has answered quite a few questions...thank you! I do have a specific question though. I have a 55 gal that I am I am cycling with 70 lbs of fiji live rock I bought from Fosters & Smith. It's been in the tank 4 days. My ammonia is off the chart (over 8 ppm) and so are the nitrates (over 5). I've read on your site not to do water changes cuz it will slow down the cycle but I'm afraid I'm killing the critters on the rock. Should I do a small change? Please help!! Thanks Jennifer
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Old 03-05-2007, 02:06 PM   #2
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Some will say no some will say yes. I did not change water in my system during the cycle. I just made sure that the water was topped off with Fresh RO/DI to keep my SG level. I'm certain that others will chime in with suggestions.
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Old 03-05-2007, 02:08 PM   #3
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IMO you should do pwc to reduce nh3/no2 which will kill off a lot of the life when it gets off the chart. Too high nh3/no2 does nothing to cultivate bacteria and can easily overwhelm the bacteria currently in the lr/tank.

Are you sure you are seeing 5 ppm for no3? Typically you don't get no3 readings after only 4 days.

I'd try a 30% pwc and recheck your readings after a couple of hours. If back within 3-5 ppm for nh3 then I'd leave it alone unless it goes off the chart again.

It could prolong your cycle time but paying $$$ for dead rock isn't worth it IMO.
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Old 03-05-2007, 04:52 PM   #4
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I agree that there is nothing saying you cant do a PWC but it will slow down your cycle. As Micah said It might be worth it.
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Old 03-05-2007, 07:58 PM   #5
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I was thinking the same thing. The worst thing that can happen if I do a PWC is a slower cycle, if I don't I have dead rock. I think I would feel better if I did the water change. The rock has been in 4 days but the LFS gave me bio balls to give the cycle a jumpstart. But I've already taken them out.
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Old 03-05-2007, 10:00 PM   #6
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Let me clear something up here. LR is rock that has nitrifying bacteria on it that causes the cycle to properly run its course. Any critters or live organisms are a bonus and help to filter and scavavge your tank. Your rock can have all the critters in it you want but if it does not have the beneficial bacteria on it it`s not live. Just clearing that up.
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Old 03-05-2007, 10:28 PM   #7
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When I cycled my tank with LR, I didn't do a water change. I had pods, corals, worms, and all sorts of algae make it through the cycle.
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Old 03-05-2007, 10:37 PM   #8
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Quote:
Originally Posted by rubikcube
When I cycled my tank with LR, I didn't do a water change. I had pods, corals, worms, and all sorts of algae make it through the cycle.
Same thing in my tank also. Hiding in the rock they are very resilient.
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Old 03-05-2007, 10:40 PM   #9
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My only concern is that ammonia and nitrites were off the chart, literally. I've never seen them that high. The ammonia was over 8 and nitrites were over 5. Fosters and Smith say not to do a water change until after 1 week. I'm running the protein skimmer so that should help a little.
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Old 03-05-2007, 11:26 PM   #10
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If you are concerned about the ammonia, do a PWC to get them down some. It may but may not slow down your cycle. You may want to try testing your water again with a different test kit. Take some water to your LFS and have them test it for you just to make sure that your kits are accurate or you at least get the same or similar numbers.
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