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Old 12-11-2013, 03:18 PM   #1
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Cycling question

I have a 75 g reef tank. I started it in early November. I thought that it had cycled in about a week but I was wrong. When I thought it had cycled I put in a yellow tang after about 12 days of it being established. 1 week later I got an arrow crab and a flame scallop. On December 1st was when I realized that it was just then cycling because in the matter of a week, ammonia went from 0-8.0. Luckily nothing died and a week later I got my ammonia back to normal. My pH, ammonia, and nitrites are good. My nitrates are still high which I expected, they are ranging from 40-80 ppm. Do I just leave it and hope that the cycle lowers it? And when is it safe to add another fish? How long should it take for the nitrates to lower?
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Old 12-11-2013, 03:58 PM   #2
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What's your ammonia at now and the rest of your params? How did you cycle your tank?
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Old 12-11-2013, 04:00 PM   #3
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About 30 percent live rock, 70 base. Ammonia:0-.25, pH:7.8-8.0, nitrites: 0
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Old 12-11-2013, 04:06 PM   #4
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Lower your trates by doing PWC's. What type of filtration are you using and how did you cycle your tank?
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Old 12-11-2013, 04:06 PM   #5
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With some live rock and some base rock
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Old 12-11-2013, 04:07 PM   #6
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Once you the ammonia gets to zero and you bring down the trates you should be good to go for adding fish
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Old 12-11-2013, 04:08 PM   #7
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What nitrate level is safe to add fish?
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Old 12-11-2013, 04:10 PM   #8
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Quote:
Originally Posted by csoutherland View Post
With some live rock and some base rock
I'm thinking the LR alone wasn't enough for cycle. You probably went through a mini cycle from the die off from the LR but there wasn't enough BB built up from it hence the spike in Ammonia when you added the tang.
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Old 12-11-2013, 04:12 PM   #9
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Let's say that it was the live rock that brought the ammonia back down, how low do the nitrates have to be to add another fish?
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Old 12-11-2013, 04:18 PM   #10
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typically you want your trates to be less than 10ppm or as close to zero as possible. if its hovering around 40ppm than you can add fish but you'll still want to be doing pwc's to bring it down. if the trates are still high after a few water changes you are going to have to find out the reason why they are so high and correct the issue. Whats your feeding schedule like?
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